The only way to do good on AQA Biology is to constantly practice. Here are a few things you should do: focus on doing exam questions by topics (which you can find
here) after you finish revising a particular topic (
ALevelBiology has all the powerpoints and notes you'll need). Don't spend too much time writing notes, as it'll be kind of useless.
Make it a routine to do questions, and use flashcards (
quizlet is a VERY good website, and has tonnes of flash cards for AQA Biology) regularly to recap your knowledge. This is the only reason I'm managing to be able to get an A at unit 5 so far