in my experience:
for essays, practice writing out a timed essay (this helps memorise quotes the best for me)
for chemistry write down a question, for ex. draw a table of flame tests or smth, and repeatedly go back to it. This is good for a lot of the specific stuff they want you to memorise for some reason.
If you want detailed responses, you should do past papers. I do phys, chem, just memorise common responses maybe by practising them in the way above. Like if you memorise 1 detailed electromagnetic induction question you should be able to answer all the similar types. Ask your teachers if your response is good. My school marked chemistry and physics incredible harshly for HSC as compared to the prelims, even though the answers could have been passed off correct, so the way you write an answer needs to be good even if you conceptually understand it.