Which IB Science Is the Easiest? A Detailed Guide

9 min read

Choosing the right IB science subject can significantly impact your experience and performance in the IB Diploma Programme. While all IB science courses require dedication and effort, some are perceived as more manageable than others. So, which IB science is the easiest?


The International Baccalaureate (IB) offers several science courses, each with its own set of challenges and learning outcomes. While the difficulty of a subject can be subjective and depend on individual strengths and interests, some science courses are generally considered easier than others. Let’s explore the various IB science subjects and identify which might be the most manageable for you.

Overview of IB Science Subjects

The IB Diploma Programme offers a range of science subjects, including:

  1. Biology
  2. Chemistry
  3. Physics
  4. Environmental Systems and Societies (ESS)
  5. Sports, Exercise, and Health Science (SEHS)
  6. Computer Science

Each of these subjects is available at both Standard Level (SL) and Higher Level (HL), with HL courses being more in-depth and demanding.

Factors Influencing Perceived Difficulty

Several factors can influence how difficult a student finds a particular IB science subject:

  • Personal Interests and Strengths: Students tend to perform better in subjects they are passionate about and naturally inclined towards.
  • Course Content: The complexity and volume of the material covered can affect the perceived difficulty.
  • Assessment Methods: The type and frequency of assessments, including exams and internal assessments (IAs), can impact how manageable a subject feels.
  • Teaching Style and Resources: The quality of instruction and available resources play a significant role in student success.

Comparing IB Science Subjects

1. IB Biology


  • Content: IB Biology covers a wide range of topics, including cell biology, genetics, evolution, and ecology.
  • Skills Required: Strong memorization and understanding of biological processes.
  • Assessments: Includes lab work, data analysis, and written exams.

Perceived Difficulty:

  • Easier for Students with Good Memorization Skills: Students who excel at memorizing and understanding detailed processes often find IB Biology more manageable.
  • Engaging Content: Many students find the content interesting and relevant, which can make the subject feel less challenging.

Tips for Success:

  • Regular Review: Consistently review notes and textbook material.
  • Use Visual Aids: Diagrams and charts can help visualize complex processes.
  • Leverage RevisionDojo: Access study guides and practice questions tailored to IB Biology for free.

2. IB Environmental Systems and Societies (ESS)


  • Content: Combines aspects of both environmental science and social sciences, covering topics like ecosystems, biodiversity, and sustainability.
  • Skills Required: Understanding of both scientific and socio-environmental concepts.
  • Assessments: Involves project work, case studies, and exams.

Perceived Difficulty:

  • Interdisciplinary Approach: The interdisciplinary nature makes it accessible to students with varying strengths.
  • Manageable Workload: Generally considered to have a lighter workload compared to other IB sciences.

Tips for Success:

  • Stay Engaged: Keep up with current environmental issues to enhance understanding.
  • Utilize Jojo AI: Use Jojo AI to clarify complex concepts and receive instant feedback on your practice questions.

3. IB Sports, Exercise, and Health Science (SEHS)


  • Content: Covers anatomy, physiology, biomechanics, psychology, and nutrition.
  • Skills Required: Application of scientific principles to sports and health.
  • Assessments: Includes lab work, practical assessments, and exams.

Perceived Difficulty:

  • Applied Science: The practical application of science to sports and health can be more intuitive for many students.
  • Relevant Topics: Many students find the topics interesting and directly applicable to everyday life.

Tips for Success:

  • Engage in Practical Work: Actively participate in practical assessments to enhance understanding.
  • Stay Organized: Keep detailed notes and regularly review key concepts.

4. IB Computer Science


  • Content: Topics include computational thinking, programming, and system design.
  • Skills Required: Logical thinking, problem-solving, and coding skills.
  • Assessments: Consists of practical programming assignments and written exams.

Perceived Difficulty:

  • Logical and Structured: Students with strong logical and analytical skills may find this subject easier.
  • Project-Based Learning: The practical aspect can be engaging and less stressful for students who enjoy hands-on work.

Tips for Success:

  • Practice Coding: Regularly practice programming to improve your skills.
  • Use RevisionDojo: Access the most comprehensive practice questions and study guides to reinforce learning for free.

5. IB Chemistry


  • Content: Covers atomic structure, chemical reactions, kinetics, and organic chemistry.
  • Skills Required: Analytical thinking and problem-solving skills.
  • Assessments: Includes lab experiments, calculations, and theoretical exams.

Perceived Difficulty:

  • Moderate Difficulty: Chemistry is often seen as moderately challenging due to the balance of theory and practical work.
  • Complex Concepts: Requires a solid understanding of chemical principles and mathematical calculations.

Tips for Success:

  • Practice Problems: Regularly solve practice problems to strengthen your understanding.
  • Lab Skills: Gain confidence in laboratory techniques through practice and review.

6. IB Physics


  • Content: Topics include mechanics, thermodynamics, waves, and electromagnetism.
  • Skills Required: Strong mathematical skills and analytical thinking.
  • Assessments: Involves lab experiments, data analysis, and written exams.

Perceived Difficulty:

  • Highly Conceptual: Physics can be challenging due to its abstract concepts and heavy reliance on mathematics.
  • Problem-Solving: Requires strong problem-solving skills and the ability to apply theoretical knowledge to practical situations.

Tips for Success:

  • Understand Fundamentals: Focus on understanding fundamental principles and formulas.
  • Use Jojo AI: Get instant explanations and feedback on complex physics problems.


While the perceived difficulty of IB science subjects can vary based on individual strengths and interests, Environmental Systems and Societies (ESS) and Sports, Exercise, and Health Science (SEHS) are often considered more manageable due to their interdisciplinary approach and practical applications. However, choosing a subject that aligns with your interests and strengths is crucial for success.

RevisionDojo provides valuable resources and support to help you excel in any IB science subject. With Jojo, get the immediate feedback and help you need. Get started free to access comprehensive study materials, personalized learning tools, and expert guidance.


Q: What makes IB ESS and SEHS easier compared to other science subjects?

A: IB ESS and SEHS are considered easier due to their interdisciplinary nature, engaging content, and practical applications, which make the material more accessible and interesting for many students.

Q: How can RevisionDojo help me prepare for IB science subjects?

A: RevisionDojo offers study guides, practice questions, past papers, and personalized study plans tailored to each IB science subject, helping you master the material and perform well on exams.

Q: What role does Jojo AI play in my IB science studies?

A: Jojo AI provides instant explanations, interactive learning experiences, and feedback on practice questions, helping you understand complex concepts and improve your performance.

Q: Should I choose an IB science subject based on its perceived difficulty?

A: While it's important to consider the difficulty, you should also choose a subject that aligns with your interests and future academic or career goals to ensure engagement and success.

Q: Can I succeed in a more challenging IB science subject with the right support?

A: Yes, with dedication, effective study strategies, and support from resources like RevisionDojo and Jojo AI, you can excel in any IB science subject, regardless of its perceived difficulty.

Choosing the right IB science subject can make a significant difference in your IB experience. Use the insights and resources from RevisionDojo and Jojo AI to make an informed decision and achieve your academic goals. Visit RevisionDojo to start your journey to IB success for free today!