Basically copied and pasted this from a response to someone else asking a similar q.
I studied English literature, maths and physics and got A*AA.
1) I found the best way to revise for science and maths was to compile all relevant information onto sheets of paper, stripping back all the unnecessary stuff, so it’s easy to refer to specifics. (Kind of like your own textbook). I did this by scanning and lifting from multiple textbooks and revision guides and using some colour for more important bits (rules or equations). Once I had all the information I needed, I just did loooaads of past papers - almost all of them. I kept track of the questions I struggled with and went back to them a couple days later after referring to the notes/book I had made.
I revised very differently for english but that’s probably less useful for you if you’re doing maths/science.
3) 99% of free periods I spent revising/ working
4) I worked every weekend and for hours after college during the week. My physics teacher was so **** I had to teach myself the physics syllabus so was spending up to 25 hours on physics a week alone.
I went from ABBC in AS to A*AA so I must have done something right! (The C was in maths which I carried on)
Physics is one of, if not, the most challenging a levels out there so it will require more rigorous study than other subjects. You have to really understand principles so you can apply them in new and strange situations.
Best advice I can give is that if you work hard and you really want it, then you can get the grades you want. Good luck!