Why rereading can mislead
Pulling an answer out of your memory strengthens that memory far more than putting the information back in front of your eyes. Rereading and highlighting feel productive because the material becomes familiar — but familiarity isn't retrievability, and exams test retrieval.
Use the retrieval loop
The method is simple: close the notes, answer questions, check, repeat. Getting it wrong and then seeing the answer still helps — the attempt itself does the work.
Make recall the default
Make it the default: any time you finish reading something, quiz yourself on it before you move on. Even two minutes of self-testing beats ten minutes of rereading.