PHY CHEM BIO 我 advice 你有補習社 notes
(我無補過, 但都覺得睇左易明好多)
phy 我會prefer H L Tam (邊間你自己search, 我唔方便講)
chem 同 bio 我校自己有notes, so no need
仲有, form 3 science should be quite easy to understand.
Try to 理解 and 合理化 the knowledge. (think of everyday LIFE examples, got it?)
Understanding is much more better than memorizing (for CE science)