Interleaving: mix topics in your revision to remember more
Learn why mixing question types in one session can improve long-term learning, with an example maths and science session plan.
GCSEA-LevelHigh SchoolAPCurriculum fit: Study skills for all GCSE, A-Level, US high school and AP courses, particularly useful in maths and science.
On this page
What is it?
Interleaving means mixing different topics or types of problem within one study session, instead of practising one type at a time (called blocking). For example, you might do one question on fractions, then one on ratio, then one on algebra.
Interleaving can feel harder and less satisfying than blocked practice, because you must work out which method each problem needs. That extra effort helps you learn to choose the right strategy, which is exactly what exams test.
Key formulas and ideas
- Blocked practice: AAA BBB CCC.
- Interleaved practice: ABC ABC ABC.
- In a 2013 review of study techniques, interleaved practice was rated as having moderate utility.
- Interleave after you have learned the basics of each topic, not before.
Worked examples
Example 1: Maths revision
Question: Plan a 30-minute interleaved maths session covering fractions, percentages and algebra.
- Pick 3 questions from each topic (9 in total).
- Shuffle them so topics alternate.
- Work through the mixed list and mark each one.
Answer: A mixed set of 9 questions alternating topics
Example 2: Science revision
Question: How can you interleave biology, chemistry and physics?
- Use 15-minute blocks, each on a different subject.
- Return to each subject over the week.
Answer: Rotate subjects within a session and across days
Example 3: Reflect
Question: Why might interleaving feel harder?
- You must decide which method to use for each question.
- Your memory is challenged each time you switch.
Answer: The switching forces you to choose and retrieve methods
Common mistakes
- Interleaving before you understand each topic.
- Switching so often that you never reach depth.
- Judging success by how easy it felt.
- Forgetting to review mistakes.
Practice questions
Frequently asked questions
Is interleaving the same as multitasking?
No. You focus on one problem at a time. You mix the order of problems, not the task you are doing.
Does it work for essay subjects?
It can: alternate between different texts, topics or question types in a session.
Related guides
Spaced repetition: how to remember what you revise
Review material at increasing gaps to remember it long term, with an example schedule and the Leitner box system.
KS3GCSEA-LevelMiddle School+3Active recall: the best way to revise (with examples)
Learn why testing yourself beats rereading, and four simple ways to use active recall: flashcards, blank-page recall and practice questions.
KS3GCSEA-LevelMiddle School+3How to use past papers to revise (and review your mistakes)
Turn past papers into focused practice with timing, mark schemes and an error review that shows exactly what to fix.
GCSEA-LevelHigh SchoolAP+1Sources and review
- Dunlosky et al. (2013), Improving Students' Learning With Effective Learning Techniques, Psychological Science in the Public Interest
- IES practice guide: Organizing Instruction and Study to Improve Student Learning (2007)
Reviewed by StudyMorrow editorial review on 5 Nov 2026.