IB Biology: A Complete Guide (2025)
Contents
As part of the International Baccalaureate Diploma Programme, IB Biology is a challenging but rewarding course, covering a wide range of topics from cell biology and genetics to ecology and evolution. Students will learn not only the fundamental concepts of biology, but also develop scientific inquiry skills and the data analysis and interpretation skills. IB Biology is a popular choice for students pursuing careers such as medicine, research, environmental science, and biotechnology. Wondering whether you should choose IB Biology or how to ace it? Read on to find out!
Why study IB Biology?
One reason to study IB Biology SL or HL is that it provides a solid foundation in the sciences, which can be useful for pursuing STEM careers ranging from traditional fields like medicine, environmental science, and research to many more fascinating and rewarding careers, such as forensic science or wildlife biology. Additionally, IB Biology teaches critical thinking, problem-solving, and analytical skills, which are valuable in many fields. By studying IB Biology, students can gain a deeper understanding of the natural world and develop skills that can serve them well in their future careers.
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Is IB Biology hard?
With an average score of only 4.4 out of 7 and a pass rate hovering around 64 to 73% in May 2024, IB Biology is undoubtedly one of the Hardest IB Subjects. There are three major reasons behind the subject's difficulty:
- Depth and breadth of the topics
- Emphasis on critical thinking and application of knowledge.
- Emphasis on scientific inquiry, data analysis and interpretation skills
IB Biology SL & HL grade distributions in 2024
Don't however let these statistics deter you from IB Biology. If anything, these statistics point out that once students master these core competencies, they are on track to achieving the top scores on IB Biology. As one IB Biology teacher we asked said,
"IB Biology is undoubtedly a challenging subject, but it's also one of the most fascinating and rewarding. It requires a deep understanding of complex biological concepts, as well as the ability to apply them to real-world situations. From genetics to ecology, the scope of the course is vast, but the knowledge gained is invaluable. As a teacher, I've seen students develop their skills, all of which are essential for success in future careers in fields such as medicine and scientific research."Overall, it means that by taking on the challenge, students are likely to be rewarded with skills and knowledge that will benefit them for a lifetime. Furthermore, students who are less confident in their math abilities can always look for help from an IB Maths tutor, who can help clarify complex concepts and provide additional practice to ensure students are on their way towards mastering the subject.
The IB Biology syllabus (2025)
The International Baccalaureate (IB) Diploma Programme (DP) Biology course is designed to provide students with a comprehensive understanding of the principles governing living organisms. The curriculum emphasizes both theoretical knowledge and practical skills, fostering critical thinking and an appreciation for the scientific method. Students explore various topics that illustrate the interconnectedness of life and the balance within ecosystems.
Curriculum Structure:
The IB Biology curriculum is organized into four broad themes, each encompassing specific concepts and levels of organization:
- Unity and Diversity: This theme explores the common features shared by living organisms due to common ancestry, as well as the rich biodiversity resulting from evolution.
- Form and Function: Students examine how the structures of organisms are related to their functions, from the molecular level to entire ecosystems.
- Interaction and Interdependence: This area focuses on the relationships between organisms and their environments, including ecological interactions and energy flow.
- Continuity and Change: Topics under this theme address genetic inheritance, evolution, and the dynamic nature of biological systems over time.
Each theme is further divided into topics that are studied at various levels of biological organization, from molecules and cells to organisms and ecosystems. This structure encourages a holistic understanding of biology, highlighting the connections between different biological concepts.
IB Biology Curriculum: Themes and levels of organization
Recent Curriculum Updates (2025):
In 2023, the IB introduced significant updates to the DP Biology course, with first teaching commencing in August 2023 and the first assessments scheduled for May 2025. The key changes include:
- Reduction of Content: The curriculum has been streamlined to focus more on core concepts, reducing the breadth of content to allow for deeper understanding.
- Removal of Options: Previously, students could choose from various optional topics. In the updated curriculum, these options have been removed, and some of their content has been integrated into the core syllabus.
- Emphasis on Conceptual Learning: The new curriculum promotes a concept-based approach, encouraging students to understand overarching principles rather than memorizing isolated facts.
- Integration of Practical Skills: There is a greater focus on developing practical and investigative skills, with an emphasis on the nature of science and scientific inquiry.
These updates aim to provide a more cohesive and relevant biology education, reflecting current scientific understanding and educational best practices. For a detailed breakdown of the updated curriculum and assessment methods, the IB has provided a subject brief outlining the changes and expectations for both Standard Level (SL) and Higher Level (HL) courses.
IB Biology vs A-Level Biology
Both the International Baccalaureate (IB) Biology and A-Level Biology courses cover fundamental biological concepts, but they differ in structure, content depth, and assessment methods.
Comparison Table: IB Biology vs. A-Level Biology
| IB Biology | A-Level Biology | |
|---|---|---|
| Curriculum Breadth | Broad, interdisciplinary approach covering multiple subjects | Focused study on specific subjects |
| Depth of Study | Depth in HL subjects; SL subjects offer foundational understanding | In-depth study of chosen subjects |
| Assessment Methods | Combination of internal assessments (practical work) and external exams; includes core components like Extended Essay and Theory of Knowledge | Primarily exam-based with some subjects including practical assessments or coursework |
| Scientific Inquiry | Strong emphasis on developing inquiry skills and applying knowledge in various contexts | Focus on theoretical knowledge with less emphasis on interdisciplinary connections |
| Grading System | Graded on a scale from 1 to 7 per subject; maximum score of 45 including core components | Graded from A* to E per subject |
Curriculum Structure
- IB Biology: Students study six subjects, including Biology, with three at Higher Level (HL) and three at Standard Level (SL). The curriculum emphasizes a broad understanding of various topics, promoting interdisciplinary learning.
- A-Level Biology: Students typically focus on three to four subjects, allowing for in-depth study in each area. A-Level Biology offers a more specialized approach, delving deeper into specific biological topics.
Assessment Methods
- IB Biology: Assessment includes both internal and external evaluations. Internal assessments involve practical laboratory work, while external assessments consist of written examinations. Additionally, students complete an Extended Essay and participate in the Theory of Knowledge course, fostering critical thinking and research skills.
- A-Level Biology: Assessment is primarily exam-based, with a focus on final written examinations at the end of the course. Some subjects may include coursework or practical assessments, such as lab reports in sciences.
Emphasis on Scientific Inquiry
- IB Biology: Places a strong emphasis on developing scientific inquiry skills, including designing and conducting experiments, analyzing data, and evaluating scientific evidence. This approach encourages students to apply their knowledge in various contexts.
- A-Level Biology: While also focusing on scientific principles, A-Level Biology tends to concentrate more on theoretical knowledge and detailed content coverage, with less emphasis on interdisciplinary connections.
Grading Systems
- IB Biology: Each subject is graded on a scale from 1 to 7, with a maximum total score of 45 points, including core components like the Extended Essay and Theory of Knowledge.
- A-Level Biology: Grades are awarded from A* to E for each subject, with final grades based on performance in examinations and any coursework components.
In summary, IB Biology offers a holistic and interdisciplinary approach, emphasising scientific inquiry and broad subject coverage, while A-Level Biology provides a more specialized and in-depth study of biological sciences. The choice between the two depends on a student's learning preferences, academic goals, and future aspirations. Whichever curriculum you're taking, don't forget IB Biology tutors and A-Level Biology tutors are always ready to offer help when you need it.
Have a look at our comprehensive set of IB Biology 2025 SL and IB Biology 2025 HL resources, developed by expert IB teachers and examiners:
📚 View IB Biology 2025 SL Practice Questions
📚 View IB Biology 2025 HL Practice Questions
📚 View IB Biology 2025 SL Study Notes
📚 View IB Biology 2025 HL Study Notes
📚 View IB Biology 2025 SL Past Papers
📚 View IB Biology 2025 HL Past Papers
What level of Biology should you choose in the IB?
The International Baccalaureate (IB) Diploma Programme offers Biology at two distinct levels: Standard Level (SL) and Higher Level (HL). Selecting the appropriate level is crucial and should align with your academic strengths, interests, and future aspirations.
Comparison Table: IB Biology SL vs. HL
| Standard Level (SL) | Higher Level (HL) | |
|---|---|---|
| Content Coverage | Covers core topics providing a broad understanding of biology. | Explores core topics in greater depth and includes additional subjects. |
| Practical Work | Requires 20 hours of laboratory work. | Requires 40 hours of laboratory work. |
| Assessment | Assessed through written exams and internal assessments with a standard difficulty. | Includes more challenging exam questions testing deeper understanding. |
| Intended Students | Suitable for those not pursuing biology at university. | Ideal for students aiming for biology-related university courses. |
Key Differences Between SL and HL:
- Depth and Breadth of Content: Both SL and HL students study the same core topics; however, HL students explore these subjects in greater depth and cover additional material. This comprehensive approach in HL is designed for students aiming to pursue biology or related fields at the university level.
- Practical Work Requirements: Practical laboratory work is integral to the IB Biology curriculum. SL students are required to complete 20 hours of practical work, whereas HL students must undertake 40 hours. This hands-on experience is essential for developing scientific inquiry skills.
- Assessment Structure: Both SL and HL students are assessed through written examinations and internal assessments. However, the HL exams include more challenging questions that test a deeper understanding of the material.
Considerations for Choosing Between SL and HL:
- Academic and Career Goals: If you plan to study biology or a related discipline at university, HL Biology provides a solid foundation. Conversely, if your interests lie elsewhere, SL Biology offers a broad understanding without the additional workload.
- Interest and Aptitude: Assess your enthusiasm for biology and your ability to manage rigorous coursework. HL demands a higher level of commitment and interest in the subject matter.
- University Requirements: Some universities have specific prerequisites for science courses. It's advisable to check the entry requirements of prospective universities to ensure your IB subject choices align with their expectations.
In summary, your choice between SL and HL should reflect your academic interests, university goals, and readiness to engage with the subject matter at the required depth. Careful consideration of these factors will help you make an informed decision that aligns with your future objectives.
Number of IB Biology SL & HL candidates and mean grades in 2024
Understanding the IB Biology grading system
The International Baccalaureate (IB) Biology grading system offers a comprehensive evaluation of a student’s performance by considering multiple aspects of their knowledge and skills. Grades are awarded on a scale of 1-7, with 7 being the highest possible score. The curriculum has undergone significant revisions, with the updated course introduced in August 2023 and the first assessments scheduled for May 2025. These changes aim to enhance conceptual understanding, emphasize skill development, and reflect contemporary scientific advancements.
Revised IB Biology Exam Structure
The assessment format for both Standard Level (SL) and Higher Level (HL) IB Biology has been updated as follows:
Standard Level (SL):
Paper 1A and 1B:
- Duration: 90 minutes
- Total Marks: 55
- Section A: 30 multiple-choice questions
- Section B: 4 data-based questions requiring short answers
Paper 2:
- Duration: 90 minutes
- Total Marks: 50
- Section A: 1 data-based question and additional short-answer questions
- Section B: 1 extended-response question chosen from two options
Higher Level (HL):
Paper 1A and 1B:
- Duration: 120 minutes
- Total Marks: 75
- Section A: 40 multiple-choice questions
- Section B: 4 data-based questions requiring short answers
Paper 2:
- Duration: 150 minutes
- Total Marks: 80
- Section A: 1 data-based question and additional short-answer questions
- Section B: 2 extended-response questions chosen from three options
Notably, the previous Paper 3, which focused on optional topics, has been removed. Relevant content from these options has been integrated into the core syllabus to streamline the curriculum.
Internal Assessment
The internal assessment component remains a vital part of the IB Biology evaluation. Students are required to undertake an individual investigation, which is a scientific research project conducted over an extended period. This investigation contributes to the final grade and allows students to explore a topic of personal interest within the field of biology.
Key Changes in the Updated Curriculum
- Conceptual Framework: The new curriculum is organized around four broad themes, each encompassing two key concepts, and is structured across four levels of organization. This design promotes a deeper understanding of the interconnectedness of biological concepts.
- Emphasis on Skill Development: There is a heightened focus on developing practical and analytical skills. The curriculum includes a dedicated section on "Skills in the study of biology," aligned with approaches to learning and emphasizing inquiry-based learning.
- Nature of Science Integration: The curriculum integrates the "Nature of Science" as an overarching theme, encouraging students to explore the purpose, features, and impact of scientific knowledge. This approach aims to develop scientific literacy and critical thinking.
These comprehensive updates are designed to provide students with a more cohesive and in-depth understanding of biology, better preparing them for future scientific endeavors. For the timeline of this year's IB Biology exam, check out the IB Exam Schedule 2025!
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What is a good IB Biology score?
A good IB Biology score demonstrates a strong understanding of the subject and high academic achievement. With the global average score for IB Biology being approximately 4.3, achieving a 4.5 or above is considered above average and reflects solid performance as of May 2024. For students aspiring to study biology or a related field at university, a score of 6 or 7 is typically regarded as a strong accomplishment, indicating an advanced grasp of biological concepts.
Universities often have specific requirements for IB scores, particularly for science-focused courses. For example, the University of Cambridge requires IB applicants to achieve a 776 at Higher Level for admissions to Biological Natural Sciences, with one of the 7s often expected in Biology. These high standards underline the importance of excelling in IB Biology for competitive university programs.
Ultimately, what constitutes a "good" score depends on a student's individual goals and academic context. A high score can enhance university applications and career opportunities, but it is equally important to focus on developing a deep understanding of biological principles and practical skills. Success in IB Biology is not just about the grade but also about building a strong foundation for future academic and professional pursuits.
How to revise and get a 7 in IB Biology?
Scoring a 7 in IB Biology requires dedication, strategy, and consistent effort. Here are key tips to help you succeed:
- Master the Core Concepts: Focus on developing a deep understanding of key principles and honing analytical and critical thinking skills.
- Practice Consistently: Regularly complete practice questions and past papers to build familiarity with the exam format and improve problem-solving skills.
- Stay Organised: Track deadlines for assignments, practical activities, and exams to ensure efficient preparation.
- Seek Support: Don’t hesitate to ask for help from teachers, Online IB Biology Tutors, or classmates, or join study groups for collaborative learning.
- Utilise Resources: Leverage textbooks, online tools, and study guides to reinforce your learning and strengthen weaker areas.
With consistent effort and effective strategies, achieving a 7 in IB Biology is well within reach!
Common mistakes to avoid in IB Biology
IB Biology is a demanding subject, and avoiding common pitfalls can significantly enhance your chances of success. Here are the key mistakes to steer clear of:
- Overlooking the Syllabus: The syllabus outlines all required content and assessment objectives. Failing to review it can lead to gaps in preparation and missed expectations.
- Neglecting Practical Work: Practical assignments are integral to the course. Ensure you complete all experiments and maintain detailed records of procedures and results to solidify your understanding.
- Skipping Past Paper Practice: Past papers help familiarize you with the exam format and highlight areas of weakness. Regular practice is critical for improvement.
- Relying on Memorization Alone: Success in IB Biology depends on understanding concepts, not just memorizing facts. Focus on grasping the principles behind the material.
- Procrastinating: IB Biology requires consistent effort. Leaving tasks until the last minute can hinder your progress. Develop a steady study routine to stay on track.
By addressing these common challenges, you can approach IB Biology more effectively and increase your chances of achieving top results.
Overview of IB Biology internal assessment
The Internal Assessment (IA) in the International Baccalaureate (IB) Biology curriculum has been updated for first assessment in May 2025. Now termed the "Scientific Investigation," the IA remains a significant component, accounting for 20% of the overall assessment.
Key Features of the Updated IA:
- Collaborative Planning: Students may collaborate in groups of up to three for planning and conducting the investigation. While methodologies can be shared, each student must formulate a unique research question and collect data on distinct variables.
- Individual Research Focus: Despite collaborative planning, each student is responsible for an individual investigation, ensuring personal engagement and accountability in the research process.
- Assessment Criteria: The IA is evaluated based on four criteria, each weighted equally at six marks, totaling 24 marks:
- Research Design: Quality and feasibility of the research plan.
- Data Analysis: Effectiveness in processing and interpreting data.
- Conclusion: Validity and insightfulness of conclusions drawn.
- Evaluation: Critical assessment of the investigation's process and outcomes.
- Word Limit: The written report must not exceed 3,000 words, with specific guidelines on what content is included in this count.
This updated IA structure emphasizes the development of scientific inquiry skills, critical thinking, and the ability to conduct independent research, aligning with the IB's commitment to fostering deep understanding and practical application of biological concepts. To learn more and get example topics, read our article: IB Biology IA: 60 Examples And Guidance.
Top resources for IB Biology preparation
Preparing for IB Biology can be challenging, but there are many resources available to help students succeed. Here are some of the top resources for preparation:
- Textbooks and Revision Guides: Textbooks are an essential resource for IB Biology students, providing detailed explanations of key biology concepts and examples of scientific experiments. Some popular textbooks and revision guides include Biology for the IB Diploma Coursebook and IB Biology Study Guide.
- Online Resources: TutorChase's IB Biology 2025 SL Study Notes, IB Biology 2025 HL Study Notes and IB Biology Q&A Revision Notes are the perfect resources for students who want to get a 7 in their IB Biology exams. They are completely free, cover all topics in depth, and are structured by topic so you can easily keep track of your progress. There are also others online resources available for IB Biology students, including including Khan Academy and Biology Online.
- Past Papers: Practicing past papers is an important part of IB Biology preparation, as it helps students to become familiar with the exam format and develop their exam technique. Past papers and mark schemes can be found on the official IB website, as well as other online resources.
- Private Tutors: An IB Biology tutor can provide one-on-one support for students who need extra help with understanding difficult concepts or preparing for exams. Many tutoring services like TutorChase specialise in IB Biology and offer personalised study plans and feedback.
By using these resources and developing good study habits, students can maximise their chances of success and achieve their academic goals.
Exploring career opportunities with IB Biology
IB Biology can open up a wide range of career opportunities for students who are interested in pursuing a career in science or healthcare. Here are some career paths that students can pursue with an IB Biology background:
- Medical Professionals: IB Biology provides a strong foundation for students who are interested in pursuing careers in medicine, nursing, or other healthcare professions. IB Biology covers topics such as anatomy, physiology, and genetics, which are essential for understanding the human body and helpful for preparing university entrance tests such as BMAT.
- Research Scientists: IB Biology provides students with the skills and knowledge needed to pursue a career in scientific research. Many IB Biology graduates go on to work in research labs or pursue advanced degrees in biology, biochemistry, or related fields.
- Environmental Scientists: IB Biology covers topics such as ecology, conservation, and sustainability, making it an ideal background for students interested in environmental science or conservation biology. IB Biology graduates can pursue careers in areas such as wildlife management, environmental consulting, or conservation biology.
- Science Communication: IB Biology can also lead to a career in science communication, where graduates can use their knowledge of biology to explain complex scientific concepts to the public. This can include careers in science journalism, science education, or science outreach.
- Online Biology Tutor: IB Biology graduates can use their knowledge to become online biology tutors, helping students understand complex concepts and prepare for exams. This career path is ideal for those who have strong communication skills and a passion for education. Online tutors can work with tutoring companies or independently, offering flexible schedules and the opportunity to impact students' learning globally.
By pursuing an IB Biology education and developing their skills and knowledge, students can open up a wide range of exciting and rewarding career opportunities.
Conclusion
In conclusion, IB Biology is an incredibly valuable subject that can provide students with a wealth of knowledge and skills that can serve them well in their future careers. Despite its challenges, it is a subject that can be both rewarding and fascinating for students who are passionate about the natural world and the inner workings of living organisms. By choosing to study IB Biology, students can gain a strong foundation in biology that can prepare them for future studies or careers in the sciences. With the right mindset, study strategies, and guidance from teachers, students can succeed and achieve their goals.
FAQ
What are some effective study techniques for IB Biology?
Success in IB Biology requires a blend of consistent study habits, understanding of concepts, and application of knowledge. Start by breaking down the syllabus into manageable sections and create a study schedule that allows you to cover all topics. Active learning techniques such as creating flashcards, drawing diagrams, and summarising information in your own words can help reinforce your understanding. Regularly review past topics to ensure the information stays fresh. Practice with past papers and time yourself to get accustomed to the exam format and pace. Group study can also be beneficial, allowing you to gain different perspectives and explanations of complex topics.
How does the IB Biology curriculum align with university biology courses?
The IB Biology curriculum is designed to give students a comprehensive understanding of the world of biology, preparing them for further studies at university level. It covers a broad range of topics, from molecular biology to ecology, similar to what is taught in the first year of a university biology course. The curriculum's emphasis on practical work, including designing investigations and collecting and analysing data, mirrors the hands-on approach used in university labs. Moreover, the critical thinking and research skills developed in IB Biology are highly valued in university studies.
What are the prerequisites for taking IB Biology?
While there are no specific prerequisites for taking IB Biology, a good understanding of basic science and math concepts will be beneficial. It's also important to have a genuine interest in biology and a willingness to engage in independent research and practical lab work. Some schools may have their own prerequisites, such as completion of a certain level of science in middle school, so it's best to check with your specific school.
How does IB Biology compare to other IB science courses like Chemistry or Physics?
Each IB science course has its unique focus and challenges. While Biology focuses on the study of living organisms and includes a significant amount of memorisation, Chemistry is more about understanding chemical reactions and requires strong mathematical skills. Physics, on the other hand, is heavily math-based and involves understanding the principles that govern the physical world. The choice between these subjects should be based on your interests, career aspirations, and strengths.
What are some real-world applications of what I'll learn in IB Biology?
The knowledge and skills gained from IB Biology have numerous real-world applications. From understanding the biological mechanisms behind health and disease, to appreciating the intricacies of ecosystems and biodiversity, the course provides a foundation for fields like medicine, environmental science, and biotechnology. The scientific research skills developed can also be applied in various professional and academic settings.
What are some common challenges students face in IB Biology and how can they be overcome?
Common challenges in IB Biology include the breadth of the syllabus, the level of detail required, and the integration of theoretical knowledge with practical skills. Overcoming these challenges involves regular and systematic study to keep up with the volume of content, using active learning strategies to retain detailed information, and gaining hands-on experience through lab work to understand practical applications. Seeking help from teachers or peers when needed can also be very beneficial.
Are there any specific software or digital tools that can aid in understanding IB Biology concepts?
Digital tools can greatly enhance the learning experience in IB Biology. Interactive platforms like Bioman Biology offer games and virtual labs that make learning fun and engaging. Online resources like Khan Academy provide video tutorials on various biology topics. Quizlet is a useful tool for creating flashcards to aid memorisation. Additionally, data analysis software like Excel or Google Sheets can be useful for processing and analysing lab data.
How much lab work is involved in the IB Biology course?
Practical work is a significant component of the IB Biology course. The curriculum requires a minimum of 60 hours of practical activities for both SL and HL students. This includes hands-on lab work, data analysis, and an individual investigation that contributes to 20% of the final assessment. The aim is to develop students' experimental and investigative skills.
Are there any recommended textbooks or resources for IB Biology?
The Oxford IB Biology Study Guide and the Pearson Baccalaureate IB Biology book are widely recommended. Online resources like BioNinja and Khan Academy are also useful for supplementing your learning. Past papers and mark schemes available on the IBO website are invaluable for exam preparation. Always check with your teacher for recommended resources as they may have specific suggestions based on your course and level.
How does the content in IB Biology relate to real-world biological issues, such as climate change or pandemics?
IB Biology covers topics like ecology and human physiology, which directly relate to real-world issues. For example, studying ecology can enhance understanding of biodiversity loss and climate change. The human physiology unit can provide insights into how diseases affect the body, contributing to a better understanding of pandemics. The course encourages students to consider the ethical and social implications of biological research, promoting informed citizenship.
What are the expectations for the individual investigation in IB Biology?
The individual investigation in IB Biology is a practical investigation conducted independently by the student. It contributes to 20% of the final grade. The investigation should be a hands-on experiment, a database analysis, a simulation, or a combination of these. It should be well-planned, with clear aims, a method that tests these aims, thorough data analysis, and a conclusion that addresses the original aims. It should also evaluate the method and suggest improvements.
What topics in IB Biology do students typically find most challenging and why?
Topics that students often find challenging in IB Biology include cell respiration and photosynthesis, genetics, and human physiology, mainly due to the level of detail and complexity involved. These topics require a deep understanding of processes and mechanisms, and the ability to apply this knowledge to different contexts. Regular review, practice, and seeking help when needed can help overcome these challenges.
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Charlie
Professional tutor and Cambridge University researcher
Written by: Charles Whitehouse
LinkedInCharles scored 45/45 on the International Baccalaureate and has six years' experience tutoring IB and IGCSE students and advising them with their university applications. He studied a double integrated Masters at Magdalen College Oxford and has worked as a research scientist and strategy consultant.
