Make sure you know what you need to know!
Check of this list of things to know! Use it as a sort of check list. Ask your teacher if there is anything on the list that doesn't make sense.
Topic Booklets!
These booklets will help you close gaps in your knowledge on a particular topic. Each booklet contains explanations of the topic, worked questions, and example questions for you to try!
Question Booklets!
You'll find no explanations and hints here! These booklets are packed full of questions for you to try yourself to check how well you understand a specific topic!
Skills Check Booklets!
Aren't sure of what you can and can't do? These are the booklets you need! These booklets contain one typical question from each topic. Work through them, when you get stuck you have found what you need to work on!
Past Papers!
Put everything you've learnt to the test! Grab a past paper, do your best, mark it, then independently close gaps if there were questions you got wrong.