How to revise a whole chapter in one evening

Most students revise by reading. You open the textbook, read the chapter, nod along, close it, and feel like you have done the work. Then you sit the test and half of it has gone.

Reading feels productive because the material looks familiar. Familiarity is not knowledge. The only way to find out what you know is to try to produce it without the book open.

Here is a method that fits one evening.

The first hour: read once, then close the book

Read the chapter properly, once. Do not highlight everything — highlighting is reading with extra steps.

Then close the book and write down, from memory, every heading and sub-topic you can remember. You will miss things. That is the point: the gaps in your list are the parts your brain did not hold, and those are the parts worth your evening.

Open the book, check your list against the real contents, and add what you missed in a different colour.

The second hour: turn every definition into a question

Go through the chapter and write questions, not notes. Instead of copying out "Newton's second law states that...", write "What does Newton's second law state?" on one line and the answer on the next.

This takes longer than copying notes and is worth every extra minute, because you can now test yourself and copied notes can only be re-read.

Aim for twenty to thirty questions for a typical chapter. Cover the answers, work down the list, and mark every one you got wrong with a dot in the margin.

The third hour: do questions you have not seen

Now sit a test on the chapter. Not the examples you worked through in class — questions you have not seen before, marked by someone other than you.

This is the part students skip, and it is the only part that tells you the truth. A question you have already seen tests your memory of that question. A new one tests whether you understood the idea.

When you get one wrong, do not just read the right answer and move on. Write down why you got it wrong. There are only a few possibilities:

• I did not know the fact.
• I knew the fact but misread the question.
• I understood the question but made an arithmetic slip.
• I ran out of time.

Those four mistakes need four different fixes, and you cannot fix what you have not named.

The next morning: ten minutes, no book

Before you start anything else, take your question list and run down it once. It will take ten minutes and you will get more of them right than you did last night.

That gap — one night of sleep — is doing real work. Testing yourself on something a day later is considerably more effective than testing yourself immediately, because the mild difficulty of a half-forgotten fact is what makes it stick.

Why this works

Three things are doing the heavy lifting here, and none of them is effort for its own sake.

Retrieval. Pulling an answer out of your head strengthens it far more than putting it in again. This is one of the most reliably reproduced findings in the study of learning, and it is why the question list beats the notes.

Spacing. A short review the next morning beats a longer one the same night.

Feedback. Marking tells you where you actually are, rather than where reading made you feel you were.

Parho is built around exactly this loop: chapter tests marked the moment you submit, a notebook that keeps every mistake with its explanation, and progress worked out from the questions you have answered rather than the hours you have sat. But the method is the method — it works with a textbook, a notebook and a friend to mark you, if that is what you have.

What does not work is reading the chapter twice and hoping.