What is spaced repetition and how do you use it?
Spaced repetition is reviewing material at increasing intervals over time, with more frequent reviews for the things you find hard and less frequent ones for the things you know. It makes memories last longer than reviewing the same amount in one block.
What most advice leaves out
Cramming works for tomorrow and fails for next month, because memories reviewed once fade quickly. Coming back to something just as it is starting to slip forces you to work to recall it, and that effort is what makes it stick. Spaced repetition is simply a way of scheduling those returns so you spend time on what you are about to forget, not on what you already know.
Step by step
- 1
Break material into small questions
Spaced repetition works on items you can test: flashcards, short questions, definitions. A whole chapter cannot be spaced; its key questions can.
- 2
Test yourself, do not reread
Each review should be an attempt to recall the answer before checking it.
- 3
Rate how hard it was
If you got it wrong or struggled, see it again soon. If it was easy, push the next review further away.
- 4
Review a little every day
Spaced repetition depends on regular short sessions. Missing days lets the queue pile up.
- 5
Start early
The method needs time between reviews. Start weeks before an exam if you can, not days.
Common mistakes
- Using it only in the week before the exam, when there is no room for spacing.
- Rating cards as "easy" when you only half-remembered them.
- Adding so many new cards each day that reviews become unmanageable.
Practise it with Migo AI Students
In Flashcards mode you can ask Migo to start a spaced repetition round. You rate each card Again, Hard or Know it, and the weak ones stay in your next review loop. Quiz Mode can then quiz you on only your weak topics. Both are free study modes.
Questions
What is the difference between spaced repetition and active recall?
Active recall is how you review: by testing yourself instead of rereading. Spaced repetition is when you review: at growing intervals. They work best together.
Does spaced repetition work for understanding, or only memorising?
It is strongest for facts, definitions and vocabulary. For deeper understanding, pair it with explaining ideas and practising questions that apply them.
Related guides
- What is active recall?Active recall is studying by retrieving information from memory, for example by answering questions with your notes closed, rather than by reading the information again. Each act of retrieval strengthens the memory and shows you what you have not learned yet.
- How to make flashcards that actually helpMake each flashcard ask one clear question with one short answer, write it so you have to recall the answer rather than recognise it, and review the cards you get wrong more often than the ones you know.
- How to revise for examsThe most reliable way to revise is to test yourself on the material repeatedly, spread over days or weeks, and to finish with timed practice in the format of the real exam. Rereading and highlighting feel like work but mostly build familiarity, not recall.
General study advice. Follow your own course’s guidance and your institution’s rules on assessment and AI use.