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Mix related topics in one session.

Interleaving: why mixing topics helps you learn

Interleaving is a study technique where you mix different topics or types of problems within one study session, instead of finishing one topic before starting the next (called blocking). It trains you to recognise which method or idea a question needs, which is exactly what exams ask of you.

The evidence

Why does interleaving work?

When you practise in blocks, you already know which method the next question needs, because it is the same as the last one. In an exam, choosing the method is half the problem. Interleaving makes you practise that choice.

Rohrer and Taylor (2007) taught students how to find the volumes of different solids. Students who practised the problem types mixed together did worse during practice, but far better on a test a week later than students who practised each type in its own block.

Kornell and Bjork (2008) found that seeing paintings by different artists interleaved, rather than one artist at a time, helped people learn to recognise each artist's style. Most participants still believed blocking had worked better, a reminder that the method that feels easier is not always the one that works.

Dunlosky and colleagues (2013) rated interleaved practice as moderately useful, with the strongest evidence in maths and in learning to tell categories apart.

Step by step

How do you use interleaving?

  1. 1

    Learn each topic first

    Interleaving works best once you have met the basics of each topic. Learn a new method in a block, then start mixing.

  2. 2

    Pick related topics

    Mix topics that could be confused with each other: types of maths problems, similar chemical tests, causes of different wars.

  3. 3

    Shuffle your practice

    Shuffle flashcards from several topics together, or answer a mixed set of past-paper questions instead of one topic at a time.

  4. 4

    Name the method first

    Before solving each question, say which topic or method it needs. That decision is the skill you are training.

  5. 5

    Expect it to feel harder

    Mixed practice feels slower and messier than blocked practice. That is normal, and the payoff shows up on the test.

Watch out

What are the common mistakes?

Interleaving before you know the basics

If you cannot do any of the problem types yet, mixing them just adds confusion. Learn first, then interleave.

Mixing unrelated subjects

Alternating history and chemistry questions does not train the useful skill of telling similar things apart. Mix within a subject.

Switching back because it feels worse

Interleaved practice usually feels less successful in the moment. Judge it by your results a week later, not by how the session felt.

Try it

How do you practise interleaving with student.study?

Make one set that spans several related topics (for example "GCSE Physics: forces, energy and motion") so the flashcards and quiz questions arrive mixed.

Shuffle a flashcard round, and use the quiz to practise choosing the right idea for each question.

Review mode mixes due cards from all your sets, which interleaves them automatically.

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FAQ

Interleaving: questions

What is the difference between interleaving and blocking?

Blocking means practising one topic or problem type at a time (AAA BBB CCC). Interleaving means mixing them (ABC ABC ABC). Blocking feels easier; interleaving tends to produce better results on later tests, especially in maths.

Does interleaving work for every subject?

The strongest evidence is in maths and in learning to tell similar categories apart. It is most useful wherever an exam question could be about one of several similar things and you have to work out which.

Should I interleave from the start?

No. Learn each new topic in a short block first, then start mixing it with topics you already know.

Sources

Research referred to on this page

  1. Rohrer, D. & Taylor, K. (2007). The shuffling of mathematics problems improves learning. Instructional Science, 35. Read the paper (opens the publisher's page)
  2. Kornell, N. & Bjork, R. A. (2008). Learning concepts and categories: is spacing the "enemy of induction"?. Psychological Science, 19(6). Read the paper (opens the publisher's page)
  3. Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J. & Willingham, D. T. (2013). Improving students' learning with effective learning techniques. Psychological Science in the Public Interest, 14(1). Read the paper (opens the publisher's page)

Last reviewed 9 November 2026

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