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what is the best textbook for aqa as chemistry and biology?
For Biology, I use the textbook from the Oxford University press. For Chemistry, I don't think a textbook is needed as the notes on the 'Chemrevise' website are very good and mark-scheme specific
For Chemistry, the board endorsed book (Oxford Uni Press) is really all you need, if you're still struggling use Chemguide, a lot of people recommend E Rintoul (youtube channel).