Read through notes which you have made and buy the CGP revision book if possible. Do as many past papers as possible and mark them. Have a friend to quiz you to see what you easily remember and recap what you don't remember or struggle with. I did all of this and got an A in Physics which I am now studying as an A-Level.
You should ask the teacher for a specification, which you will also be able to find on the Edexcel website. This will give you a detailed list on the topics you need to revise. Then simply start at the beginning of the list and get out those notes! :) It helped me a lot when I used the specification for Chemistry last year and I got an A*. Good luck!