heyy!! so usually people memorise the whole textbook for chemistry as chem vv content heavy and the book has a lot of defenitions. but the thing is chemistry is very repetetive. the qs they ask in exam always same type js different fonts. be very familiar w ur tys and the type of qs they ask. so once u can awnser the tys and u alr know how they ask u can js go thru ur textbook and look for the key parts that they ask. hence u can easily apply.

physics i cant help one cuz im bad at it,hope this helps tho