You read the page. You recognise every line. Nothing is new, so it feels learned. Then the exam asks for it with the page closed, and the sentence that was so familiar has nowhere to come from.
Recognising and recalling are different jobs
Recognising is easy: the page is in front of you and your brain says “yes, seen this”. Recalling is harder: nothing is in front of you and you have to produce it. Rereading practises the first job over and over. Exams mostly ask for the second. That is the whole trick, and it is why the fourth read-through feels productive and changes very little.
A two-minute test
Pick one small topic, small enough to fit on half a page. Close the notes. Write or say everything you can about it, in your own words, badly if necessary. Stop after two minutes. Now open the notes and compare.
What you wrote is what you currently hold. What you missed or muddled is the gap, and the gap is the useful part: it tells you exactly what to practise next.
An example of the gap
Say the topic is “the stages of a process you have to know in order”. Closed-notes attempt: you get stages one, two and four, and you cannot remember three or what links two to four. The gap is specific: the third stage and the link. The next practice question writes itself: “What happens between stage two and stage four, and why?” That question does more than another read of the whole chapter.
The action
Do one closed-notes attempt today on one topic you think you know. Keep the gap and turn it into one question you can ask yourself tomorrow without the notes. The free closed-notes check keeps the three steps separate so you cannot skip the comparing part.
The honest limit
This is a self-check, not marking. It tells you what came back; it does not tell you whether what came back was right. Check against your notes or textbook, and treat a confident wrong answer as a gap too. If you keep finding the same gap, that is the topic to take to a teacher or a tutor.