You wanted help on revision tips? Well, what I do is that I basically go over the theory by making brief notes on a particular topic that requires high marks in the actual exam. I then read over it and basically answer lots and lots of past paper questions, to really test my knowledge. This way, I know what the mark scheme wants me to write in the real exam and I can then get good marks in the real one as Im writing down the mark scheme.
I really hope I made sense and please let me know if this helps. ****x :D