The 20-Minute Revision Routine That Got My Class an Average of A

If you have ever told a student to "just put a few extra hours in this weekend", you will know how that ends. They sit in front of their notes, scroll on their phone, panic, scroll some more, and finish the afternoon believing they are bad at the subject.

I taught maths for fifteen years before I started thinking seriously about why revision tends to fail. The answer turned out to be embarrassingly simple. We were asking teenagers to do something that adults would never do voluntarily: sit alone for a long time, with no feedback, and decide for themselves whether they had got better.

So a few years ago I asked one of my Year 11 groups to try something different. Twenty minutes a day, every weekday. No marathons. No giving up the weekend. The condition was that it had to be active, not reading, and that it had to end with a question they could not answer.

Here is what that twenty minutes looks like.

Minute 0 to 3. They open the topic list for that week and pick the area they were least confident about in lesson. They write the topic title at the top of a fresh page.

Minute 3 to 10. They attempt three questions from memory. Not three easy questions. Three at the hardest level they have seen so far. They do not look anything up.

Minute 10 to 15. They mark their attempt against the worked solutions. They are honest. If a step is missing, they note it.

Minute 15 to 20. This is the part nobody else seems to do, and it is the part that actually works. They write the single question that they still cannot answer. Not "I don't get differentiation". A specific one. "I cannot do question 4c because I do not know whether to use the chain rule or the product rule."

The next morning, before form time, that one question is the first thing they look at. Often someone else in the group has the same one and they sort it out between them. Sometimes I get an email. Either way, the question stops being a hidden anxiety and becomes a small, fixable problem.

I tracked the group's mock results across the year. The average went from a low B at the autumn mock to an A at the spring mock. Two students who had told me they would never get a 7 ended up with 8s.

I wish I could tell you it was the maths content that did it. It wasn't. It was the habit of finishing each session with a precise, written question. That single change took the fog out of revision.

If you teach, try this for one term with one group. If you are a student reading this, try it for a fortnight. You will know within ten days whether it is working.

You don't need six hours. You need twenty minutes, every day, ending with a question you can name.