Exam Practice
Past papers and exam questions by topic - This is past paper penguin, a great site for revision. Use it!
Exam questions by topic. - A great site to test your knowledge on some very good exam style questions with solutions
More past papers. This link has tons of past papers being completed. Click on one and have a go at each question and watch the solution.
Before Exam Practice
The best resource I have found to start your revision is EXAM HACK.
A great resource for improving subject knowledge on topics and what questions are likely to come up,
Watch and listen. Great advice and a lot of ground work put in by him. Click here
https://www.youtube.com/watch?v=klS5WljDDbA&list=PLVJAmgpEnrmOft2MF56rHJwTlRPAm_ffV