Everything You Need To Know About the IB

The International Baccalaureate (IB) is a globally recognised education system known for its emphasis on academic rigour, critical thinking, and holistic student development. Established in 1968 in Geneva, Switzerland, the IB aims to provide students with an internationally minded education that prepares them for higher education and global citizenship. Today, thousands of schools in more than 150 countries offer IB programmes, and the IB Diploma is recognised and respected by top universities worldwide for producing well-rounded, intellectually curious, and independent thinkers.

The IB encourages students not only to excel academically but also to grow as individuals who are socially responsible, ethical, and culturally aware. Its philosophy goes beyond traditional curricula by building skills in problem-solving, critical inquiry, and independent research, all of which are essential for university and career success.

Key Takeaways

• The IB offers four programmes for students aged 3 to 19. The Diploma Programme (DP) is the two-year course for students aged 16 to 19.
• DP students take six subjects, one from each subject group (or two from one group instead of the arts), usually three at Higher Level (HL) and three at Standard Level (SL).
• Every DP student also completes the core: Theory of Knowledge (TOK), the Extended Essay (EE) and Creativity, Activity, Service (CAS).
• Each subject is graded from 1 to 7, and TOK and the EE together add up to 3 bonus points, for a maximum of 45 points.

What Is the IB Programme?

Overview of the IB's Structure

The IB offers four programmes aimed at different age groups and stages of development. Its mission is to develop inquiring, knowledgeable, and caring young people who are motivated to make a positive difference in the world. All four programmes use a student-centred, inquiry-based approach to learning.

Each programme is designed for a different stage of a student's education, so students can progress from one to the next. Across all of them, the IB focuses on life skills such as critical thinking, research and empathy.

The IB Learner Profile

At the heart of every IB programme is the IB learner profile: ten attributes that the IB believes help young people become well-rounded, compassionate and globally minded. They guide all IB programmes, from the PYP to the DP.

The learner profile is central to the IB's mission of creating lifelong learners and responsible global citizens.

The IB Diploma Programme (DP)

The Diploma Programme is the IB's best-known programme. It is a two-year course for students in their final years of secondary school, designed to provide a balanced education that builds intellectual, emotional and ethical growth.

Students study six subjects: one from each of the six subject groups. Instead of an arts subject (group 6), students can take a second subject from another group. Normally, three subjects (and no more than four) are taken at Higher Level (HL) and the rest at Standard Level (SL). The IB recommends 240 teaching hours for HL subjects and 150 hours for SL subjects, and HL subjects are studied in greater depth and breadth.

In addition to their subjects, all DP students complete the three elements of the core:

• Theory of Knowledge (TOK): a course that asks students to reflect on the nature of knowledge and how we know what we claim to know.
• Extended Essay (EE): an independent research project of up to 4,000 words on a topic the student chooses.
• Creativity, Activity, Service (CAS): experiences in creativity, physical activity and service that promote personal growth, well-being and community involvement.

Below, we look at each part in more detail.

Subjects

How Are Subjects Assessed?

Each DP subject combines internal assessment and external assessment.

Internal assessment (IA) is completed at school and marked by teachers using IB criteria. It usually makes up 20–30% of the final grade. Depending on the subject, it might be a written report, an investigation, an oral, a portfolio or a practical project. The IB then moderates the marks: it reviews a sample of work from each school and adjusts marks if needed, so that standards are the same around the world.

External assessment is usually made up of exams at the end of the course, marked by IB examiners. These typically make up 70–80% of the final grade and can include multiple-choice, short-answer, data-based and essay questions. Some subjects also include externally assessed coursework.

Group 1: Studies in Language and Literature

This group focuses on the study of a student's first or best language. Students analyse texts, explore how language works and look at how culture is expressed through language. There are three courses:

• Literature (see our IB English Literature guide)
• Language and Literature (see our IB English Language and Literature guide)
• Literature and performance, an interdisciplinary SL course shared with group 6.

❓ The IB offers Literature and Language and Literature courses in many different languages, not just English.

Example: English Language and Literature

Group 2: Language Acquisition

Group 2 develops skills in an additional language and builds intercultural understanding. There are two main types of course:

• Language B, for students who already have some experience of the language, offered at SL and HL.
• Language ab initio, for beginners, offered at SL only.

Popular group 2 languages include French, Spanish, Chinese, Japanese and Italian.

Example: Language B

Word counts are for languages written in the Latin alphabet. The IB has announced a new Language B course, first assessed in 2029.

Group 3: Individuals and Societies

Subjects in this group focus on human behaviour, societies and global issues, giving students tools to analyse the world around them. They include:

• Business Management
• Digital Society (which replaced ITGS)
• Economics
• Geography
• Global Politics
• History
• Philosophy
• Psychology
• Social and Cultural Anthropology
• World Religions
• Environmental Systems and Societies (an interdisciplinary course that counts for group 3, group 4 or both).

Example: History (current course)

A new History course will be first assessed in 2028.

Group 4: Sciences

Subjects in this group challenge students to explore the natural world through observation, experimentation and critical analysis. They include:

• Biology
• Chemistry
• Computer Science
• Design Technology
• Physics
• Sports, Exercise and Health Science
• Environmental Systems and Societies (interdisciplinary, see group 3).

Example: Biology, Chemistry and Physics (first assessed 2025)

Students also take part in the collaborative sciences project, an interdisciplinary group project. It is required but not graded.

Group 5: Mathematics

There are two mathematics courses, both offered at SL and HL:

• Mathematics: Analysis and Approaches (AA), which is more theoretical and suits students who enjoy algebra, proof and calculus.
• Mathematics: Applications and Interpretation (AI), which focuses on modelling, statistics and real-world problems.

New AA and AI courses will be first assessed in 2029.

Group 6: The Arts

Subjects in this group encourage students to engage creatively and expressively. Students who are not interested in the arts can take a second subject from another group instead. The arts subjects are:

• Dance
• Film
• Music
• Theatre
• Visual Arts

Assessment varies between the arts subjects, but most combine practical, creative work (such as performances, portfolios or exhibitions) with written or presented work that shows research, analysis and reflection. Because so much of the work is coursework, the arts are assessed differently from most other groups. See the individual subject guides for the details.

Theory of Knowledge (TOK)

Theory of Knowledge is a central part of the Diploma Programme. It asks students to reflect on the nature of knowledge and how we come to understand the world, linking all of their other subjects together.

What Is TOK?

TOK encourages students to examine how knowledge is produced, to question the certainty of what we "know", and to reflect on how their own perspectives shape their understanding. This focus on "thinking about thinking" builds awareness of bias, assumptions and perspective.

The course explores questions such as:

• What counts as knowledge?
• How do we know that something is true?
• How do our beliefs and values influence what we accept as knowledge?

The current course (first assessed in 2022) is built around:

• The core theme, "knowledge and the knower"
• Two optional themes, chosen from knowledge and technology, knowledge and language, knowledge and politics, knowledge and religion, and knowledge and indigenous societies
• Five areas of knowledge: history, the human sciences, the natural sciences, mathematics, and the arts.

Why Do IB Students Study TOK?

TOK develops skills that matter for academic success and personal growth:

• Critical thinking: analysing assumptions, questioning certainty and evaluating evidence.
• Interdisciplinary understanding: seeing how different subjects approach and interpret knowledge.
• Open-mindedness: appreciating diverse perspectives and becoming aware of cultural, social and personal biases.
• University preparation: the inquiry and analysis that TOK requires are exactly what universities expect.

TOK Assessment

TOK is graded from A to E. Read our tips on how to score an A in Theory of Knowledge.

The Extended Essay (EE)

The Extended Essay is a compulsory, independent research project of up to 4,000 words. Students choose a topic, write a focused research question and carry out an investigation, with guidance from a supervisor, who is usually a teacher at their school. It prepares students for the kind of research and academic writing they will do at university.

The IB has introduced a new Extended Essay for students first assessed in 2027. Under the new model:

• Students take either a subject-focused approach (one DP subject) or an interdisciplinary approach (combining two DP subjects).
• Students attend three formal reflection sessions with their supervisor. The last is the viva voce, a short final interview about the finished essay.
• At the end of the process, students write a 500-word reflective statement.
• The essay is assessed against five criteria: framework for the essay; knowledge and understanding; analysis and line of argument; discussion and evaluation; and reflection.

Source: IB Extended essay guide, first assessment 2027. For the full details, see our complete guide to the 2027 Extended Essay.

Why Do Students Complete the EE?

• Research and inquiry: students learn to collect, analyse and interpret data or sources.
• Academic writing: students learn to structure an argument, support it with evidence and reference sources correctly.
• Critical thinking: students tackle a complex question and reach a reasoned conclusion.
• Time management: because the EE runs over several months, students learn to plan and manage a long project.

The EE is graded from A to E, and the grade is combined with the TOK grade to give up to 3 bonus points.

Creativity, Activity, Service (CAS)

CAS asks students to take part in a range of experiences alongside their studies throughout the DP:

• Creativity: arts and other experiences that involve creative thinking.
• Activity: physical exertion that contributes to a healthy lifestyle.
• Service: unpaid, voluntary work that benefits the community and has a learning benefit for the student.

CAS is not graded and does not add points to the diploma score, but students must complete it to receive the diploma.

The Grading System in the IB

The 7-Point Scale

Each subject is graded on a scale from 1 to 7, based on both internal and external assessment.

A 7 at HL is worth the same number of points as a 7 at SL.

How Your Diploma Score Is Calculated

• Subject grades (up to 42 points): six subjects, each graded from 1 to 7.
• Core points (up to 3 points): awarded for the combination of your TOK and EE grades.

That gives a maximum of 45 points. The table below shows how the IB awards the core points.

Source: IB, DP passing criteria.

To be awarded the diploma, students need at least 24 points, must complete CAS, and must avoid the IB's other failing conditions. For example, an E in TOK or the EE means no diploma. For a full breakdown, see our guide to how your IB score is calculated.

Grade Boundaries and Moderation

To keep results fair and consistent around the world, the IB sets grade boundaries for every subject in every exam session. Grade boundaries are the minimum marks needed for each grade from 1 to 7.

• Setting boundaries: after the exams are marked, senior examiners review student work and set the boundaries based on the quality of work, not a fixed percentage.
• Allowing for difficulty: if a paper turns out to be harder than in previous sessions, boundaries can be lowered so students are not penalised. If it is easier, they can be raised.
• Moderating internal assessment: the IB reviews a sample of each school's internal assessment and adjusts marks if a teacher has marked too generously or too harshly.

This process makes sure that each student's final grade reflects their real performance against a global standard.

What Makes the IB Unique?

Critical Thinking and Inquiry-Based Learning

At the core of the IB is a commitment to critical thinking and inquiry. TOK challenges students to question how we know what we know. The EE gives them experience of independent research. Across every subject, coursework focuses on analysis, application and evaluation rather than memorisation. These habits prepare students for university and for solving real-world problems.

Global Perspective and Cultural Awareness

One of the IB's main aims is to develop internationally minded students who understand and appreciate cultural diversity:

• An international curriculum: subjects include global issues, cross-cultural studies and different perspectives.
• CAS: students engage with their communities, often through projects that need cultural awareness and social responsibility.
• A diverse school network: IB schools in more than 150 countries mean students often learn alongside peers from many different backgrounds.

University and Career Preparation

The IB is highly regarded for preparing students for university and beyond:

• Independent research skills: the EE gives students experience of research methods, academic writing and long-term planning.
• Time management: balancing six subjects with TOK, the EE and CAS teaches students to organise their time, a vital skill at university.
• A broad curriculum: studying across languages, sciences, mathematics and the humanities develops versatile skills that universities and employers value.

Wondering whether it's the right choice for you? Read our article on whether the IB is worth it.

Potential Challenges of the IB

The IB has many benefits, but its demands can also be challenging.

1. Intensity and Workload

Students take six subjects, complete the EE and TOK, and meet CAS requirements. Balancing all of this, especially with HL courses, can be overwhelming.

• Time management strain: students who struggle with organisation can find it hard to keep up with assignments, internal assessments and other commitments.
• Academic pressure: the IB's rigorous assessment means students need to work consistently across all subjects.

2. Stress and Well-Being

The workload and high expectations can lead to stress and anxiety, especially when students feel pressure to achieve top scores for university admission.

• Burnout risk: long hours of coursework, research and CAS can lead to burnout, especially alongside other commitments.
• Well-being: it is important for students to look after themselves, build good coping strategies and ask for help when they need it.

3. Cost and Accessibility

Registration and exam fees, as well as resources, can be a financial burden for some families, and in some regions only a few schools offer the IB.

4. Required Subject Range

The IB's requirement to study across all subject groups gives students a balanced education, but it can be challenging for those who want to specialise. Students may also find some required subjects difficult, which can affect their overall score.

Tips for Succeeding in the IB

1. Study and Time Management Skills

• Use a planner: track deadlines, assessments and goals, and break large tasks like the EE and IAs into smaller steps.
• Prioritise tasks: focus first on the tasks with the closest deadlines or the biggest impact on your grades.
• Study consistently: a regular routine stops material from piling up and makes revision before exams much easier.

2. Choose Your Subjects Wisely

• Play to your strengths: take subjects at HL where you feel confident and have a genuine interest.
• Balance interests with requirements: consider taking subjects outside your strengths at SL, so you meet the requirements without overloading yourself.
• Think about your future: check university entry requirements. For example, many engineering courses expect HL mathematics and physics.

3. Work With a Tutor Who Knows the IB

• Content and exam technique: an experienced IB tutor can help you master difficult concepts and learn strategies for timing and structuring answers.
• Guidance on IAs and the EE: a tutor who knows the IB criteria can give feedback that helps your work meet them.
• Accountability and support: a tutor can help you set goals, track progress and stay motivated during busy periods.

💡 Check out these five key habits of high-achieving IB students.

Conclusion

The International Baccalaureate stands out for its commitment to developing globally minded, well-rounded students who are ready for university and beyond. Its combination of six subjects, TOK, the Extended Essay and CAS is demanding, but it builds the research, writing, critical-thinking and time-management skills that universities value. With good planning, consistent study and the right support, students can thrive in the IB and finish with a diploma that is respected around the world.

Get Support With the IB

Our experienced IB tutors support students in every subject group, as well as with TOK, the Extended Essay and internal assessments, online wherever you are.

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