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How to Choose Subjects in Years 9 to 11 (IGCSE, A-Level, IB)

William CognityBy William Cognity · 10 August 2026 · 3 min read

Between Years 9 and 11, many students must choose the subjects they will study for national exams. These choices can open or close doors later. This guide explains the main systems and gives you a simple way to choose.

Why this choice matters

Many university courses ask for certain subjects. For example, engineering often asks for maths and physics. Medicine often asks for chemistry and biology. If you drop a subject too early, you may not be able to apply to some courses. So think about the future before you choose, but do not panic. You can still change direction later in many cases.

A quick look at the main systems

IGCSE

The IGCSE is an exam for students around ages 14 to 16. Students usually take several subjects, often a mix of languages, maths, sciences and humanities. Many international schools use it. Schools often ask you to keep maths, a language and at least one science.

A-level and AS-level

After IGCSE, many students study A-levels. Most take three or four subjects in depth. The depth is useful if you already know what you like. But it means you narrow your options earlier than in some other systems.

IB Diploma

The International Baccalaureate Diploma is a two-year programme. Students study six subjects from different groups, plus three core parts such as an extended essay. It keeps your options wider. But it is a big workload, so it suits students who like variety and can manage many tasks.

Different schools and countries run these systems in slightly different ways. Always ask your school for its exact rules.

A five-step method

  1. List what you enjoy and do well. Look at your marks, but also at which classes you look forward to.
  2. Look at your possible goals. Write two or three careers or courses you might like. Do not worry if you are not sure.
  3. Check the entry rules. Search for the subjects that those courses ask for. Use university websites.
  4. Balance your list. Pick a mix of subjects you are strong in, subjects you love, and subjects that keep doors open.
  5. Talk to people. Ask teachers, older students and a counsellor.

The three-circle test

Draw three circles. In the first, write what you are good at. In the second, write what you enjoy. In the third, write what your future goals may need. The best subjects sit where the circles meet. If a subject is only in one circle, think twice.

Keep doors open

If you are unsure, choose subjects that fit many paths. Maths and a science are useful for many courses. A strong language skill helps in almost every field. Try to avoid dropping a core subject only because it feels hard right now.

Mistakes to avoid

  • Choosing a subject only because a friend did.
  • Choosing a subject only because the teacher is nice.
  • Choosing the easiest subjects to protect your marks.
  • Ignoring the entry rules of courses you may want.

What parents can do

Parents can ask questions instead of giving orders. Try: What do you like about this subject? What could you do with it later? Help your child find facts, but let them make the choice.

Can you change later?

Often yes, but it depends on your school and timing. Ask when the last day to change is. Also ask if you can add a subject later or retake an exam. Knowing the rules early reduces stress.

Check your plan

Once you have a list, test it. Ask: Which courses are still possible with this list? Which are closed? If a path you like is closed, you can still change your list now. A counsellor can help you check this against real university rules.

Next step: if you want help turning your answers into a clear plan, see 1:1 coaching.

Next step: try the free 4-factor quiz, or see the 4-4-4-4 toolkit.

Questions

Can I study medicine if I drop biology?

Most medicine courses ask for biology or chemistry, so check the exact rules before you drop either subject.

Is the IB harder than A-levels?

They are different. The IB covers more subjects and has more tasks. A-levels go deeper in fewer subjects.

When should I start choosing?

Start thinking at least a year before the deadline. Early planning gives you time to ask questions and change your mind.

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