What is interleaving?
5 min read · updated 2026-09-01
Interleaving is a revision technique where you mix different topics or subjects within a study session instead of blocking them. Research shows it produces better long-term retention than blocked practice, even though it feels harder in the moment.
Blocked vs interleaved practice
Blocked practice: AAA BBB CCC (all algebra, then all trigonometry, then all statistics). Feels efficient but creates an illusion of mastery. Interleaved practice: ABC BCA CAB (mixing algebra, trigonometry and statistics within the same session). Feels harder but produces better long-term retention and transfer.
Why it works
Interleaving forces the brain to continuously retrieve and discriminate between different strategies. In blocked practice, you know the topic before you start, so the brain can go on autopilot. Interleaved practice trains the brain to identify which strategy to use, which is exactly what exams test.
How to implement it
- ✓ Within a subject: mix question types (algebra + geometry + statistics) in one session
- ✓ Across subjects: alternate between maths, science and English in the same evening
- ✓ Use the error log to choose which topics to interleave (weakest topics appear most often)
- ✓ Combine with spaced practice: return to the same topics after increasing intervals
FAQs
Does interleaving work for essay subjects too?＋
Yes, by mixing essay plans from different topics or texts within the same session. The principle is the same: forcing the brain to switch between strategies deepens learning.
Does interleaving feel harder?＋
Yes, and that is the point. Research consistently shows that interleaved practice feels harder but produces better retention. Students who trust the process and stick with it see the benefit in mocks and exams.
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