For both Biology and Chemistry I’ve outline how I revised in this post. I made summaries for A-level Chemistry which you can find here. In order to consolidate your AS content I’d recommend repeating the 3 steps I mentioned in the above linked blog post and making sure you’re getting regular practise in to assess yourself.
When I was doing A-level Chemistry I created myself this mechanisms summary alongside flashcards covering very reaction and mechanism that is needed for the exam. A large part of the A-level Chemistry exams require you to know the reactions really well so I by testing myself using both of the above resources I made for myself I made sure I had learnt them the best I could. You could find methods to keep re-testing yourself on the content to help consolidate your knowledge.
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