How to revise for IB exams without wasting the time you have
8 September 2026 8 min read
Almost every IB student revises by re-reading. It feels productive, it takes hours, and it is close to the least effective thing you can do with the time. The research on this is unusually consistent, and so is what examiners report: the students who improve are not the ones who covered the most content, they are the ones who practised retrieving it under conditions resembling the exam.
This is not an argument for working harder. Most IB students are already at the limit of hours available. It is an argument for spending the same hours differently, and the difference is measured in grades rather than effort.
Re-reading feels like learning and is not
When you re-read a page you have seen before, it feels familiar, and your brain reads that familiarity as understanding. It is not the same thing. You can recognise every line of a Chemistry chapter and still be unable to produce a single mark-worthy answer about it, because recognising and retrieving are different skills and only one of them is examined.
The test is simple: close the book and write down what was on the page. If you cannot, you have not learned it, however many times you have read it.
Do questions before you feel ready
The instinct is to finish revising a topic and then test yourself. Reverse it. Attempt questions on a topic you only half know, get them wrong, and then read the mark scheme. The gaps that exercise exposes are the ones worth spending time on, and you will remember the correction far better than anything you read first.
This is uncomfortable, which is most of why students avoid it. Getting a question wrong in April is information. Getting it wrong in May is a grade.
Read the mark scheme like a rulebook
IB mark schemes are not model answers, they are lists of what earns credit. They tell you exactly which words and steps carry marks - that stating the derivative before setting it to zero is worth something on its own, that an explanation needs a causal chain and not just a description.
Students who read mark schemes closely start writing in a way that collects marks they were previously leaving behind. That is often worth more than another month of content revision, because the knowledge was already there.
Space it out, and let the hard things come back
Reviewing something once and moving on means forgetting most of it within weeks. Reviewing it again just as it starts to fade is what makes it stick, and the gaps can grow: two days, then a week, then a month.
The practical version is not complicated. Keep track of what you got wrong, and make sure it comes back to you rather than relying on noticing it again by chance.
Work to the clock earlier than feels sensible
IB papers give you very little time per mark. A student who can answer a question in fifteen minutes but has eight will lose marks they had the knowledge for, and no amount of further content revision fixes that.
Practising under time is unpleasant, so most people leave it until the last few weeks. Starting earlier turns timing into a skill you build rather than a shock you discover.
In short
- Close the book and write it down. If you cannot, you have not learned it.
- Attempt questions before you feel ready, then read the mark scheme line by line.
- Keep a record of what you got wrong so it comes back to you.
- Practise to the clock months before the exam, not weeks.
Put it into practice
40,000+ past-paper questions with mark schemes, timed practice, and flashcards that bring back what you got wrong. Free.
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