Umm I dont know. Im just a student I can just suggest things.can u mention which chapters should I finish in September
If I were you Id start from the start.Energy and respiration and Photosynthesis...
One more thing,if you need topic wise past papers then check this thread:
https://www.xtremepapers.com/community/threads/a-level-a2-biology-topical-question-bank.35678/
Oh and this might also help,maybe:
https://www.youtube.com/channel/UCWZtJoFf-INn0A3j07a4MsA
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