Why re-reading your notes doesn't work

Most people study by re-reading. You go back over the chapter, the slides, the notes you took in class. It feels like it is working, because each pass feels smoother than the last.

That smoothness is the trap.

Familiarity is not memory

The second time you read a page, you recognise it. Recognition feels like knowing. But recognising something in front of you is a completely different task from producing it when it is not.

An exam never asks you to recognise your notes. It asks you to produce an answer from an empty page. If you have only ever practised the first task, you have not practised for the exam at all.

This is why people walk out of an exam genuinely surprised. They did know the material - in the presence of the material.

Testing yourself is the actual study method

The alternative is retrieval practice: close the notes and try to produce the answer. It is slower, it is uncomfortable, and you will get things wrong.

The discomfort is the point. Every time you drag an answer out of memory, you strengthen the path back to it. Reading the answer does almost nothing by comparison.

The catch is that retrieval feels worse while you are doing it. You are supposed to struggle. Students consistently rate re-reading as more effective than self-testing, and consistently perform worse with it.

What to do instead

• Turn each thing you need to know into a question, and answer it before checking.
• Get it wrong on purpose, early. A wrong answer you then correct sticks better than one you never attempted.
• Space the attempts out. Answering something correctly today tells you nothing about next week.
• Do not re-read the material until after you have tried to recall it.

The last point is the one people skip. Try first, read second. Reading before you attempt recall converts the whole exercise back into recognition.

Where this leaves you

Retrieval practice is not complicated. The reason it is rare is that it feels bad and takes longer per item, so it loses to re-reading every time you are choosing based on how studying feels.

If you want it to happen at all, it has to be the default - not a thing you have to decide to do.