Using a Timer for Exam Revision

Written by the QuickTimer editorial team. Published 3 November 2026. General information only.

A timer is one of the simplest and most useful exam tools. It splits revision into blocks you can actually finish, and it lets you practise the thing you will be tested on: answering questions within a fixed time. This guide covers both uses.

Part 1: Timing your revision

Use blocks, not hours

"Revise for three hours" is vague. "Do four 40 minute blocks, each on one topic" is something you can tick off. Pick a block length that suits you:

Give each block one job

• One topic per block. "Cell biology: respiration" is a good block. "Biology" is not.
• End with recall. In the last five minutes, close your notes and write down everything you remember, then check what you missed.
• Mix subjects across the day so you are not doing the same type of thinking for hours.
• Protect sleep. Late-night extra blocks usually cost more than they gain.

Part 2: Timing your answers

Minutes per mark

Most exams give you roughly a minute per mark. The calculation is simple:

1. Take the exam length in minutes.
2. Subtract time for reading and checking. Taking off 10% is a sensible default.
3. Divide what is left by the total marks.

The table below uses a 10% allowance for checking:

Your exam may differ, so check the paper's rubric, which usually states the marks and the time. Some papers reward longer essay answers; use the table as a starting point and adjust.

Practise past papers against the clock

1. Choose a past paper and set the timer for the full exam length, using the exam timer, which warns you at 15, 5 and 1 minutes left.
2. Sit at a desk, with only what you will be allowed in the exam.
3. When time is up, stop writing, even mid-sentence. Then mark your paper and note where you ran short.
4. Repeat with a different paper a few days later and see if your timing improves.

If you are still learning the material, do your first attempt untimed, and add the clock once you can answer most questions without looking at your notes.

What to do when time is running short in the exam

• Move on at the limit. When your allowance for a question is gone, go on to the next. Marks are usually easier to win on a fresh question than on the last marks of a hard one.
• Leave a note. Mark where you stopped so you can return quickly if there is time.
• Use the last minutes for the biggest gains, such as finishing a short answer or completing a calculation, not rewriting.

For teachers and invigilators

A visible countdown helps students pace themselves. The classroom timer can be shown full screen on a projector, and the exam timer gives time warnings at set points. Always follow your exam board's official timing rules for formal assessments.

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