Make notes using the specification- like under each point on the specification make notes using the chemical ideas textbook.
Use the 4 college website- it's amazing
Memorise the cgp guide and revise A2 Chem revision guides so that you can get an understanding of the chemistry.
After doing a past paper, make sure you write out the corrections on separate paper- even if you get the question right, still write out the correct answer on separate paper. Memorise this booklet of corrections. It helps SO much. Not just for chemistry. The past paper correction booklet thing literally was 70% of the reason I got an A last year for AS Chem.
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