for my A level bio i used to make notes, but towards exam season I would "blurt" to revise and found it really useful. Past papers were life savers too, but you run out after a while and they don't cover absolutely everything.
Now, 3 years post A-level, I look back and think that maybe notes aren't the most efficient way... they're good for consolidating knowledge but only for very short term.
If I had to go back I would use flashcards because they act as notes AS WELL AS active and repetitive recall. Quizlet is good, but I prefer ANKI (can use offline, easy to organise and works with repetition). So far has helped me in uni (in medicine, so a science and content heavy course)
Hope this helps!