I got predicted an A in A level maths (OCR A), but I would like to get an A*. How can I revise more effectively?
Not much to "revise". Of course, if you struggle conceptually, go back to your textbook. But after a point it just gets useless to go over concepts. I grinded past papers for 2 weeks before my exam and got an A*. You get a hold of the pattern of question and the pattern of answering, it is easy. Just do enough past papers to kind of train your brain to identify similar questions and apply the same method. They aren't going to ask mind-bending questions at A-level