Here are some tips and other items to help you.
+ When revising, don’t just read the textbook. Your brain is wired to make things easier for itself: you will read the easy bits (what you already know) and skim or miss out the hard bits (what you need to know).
+ An effective way to revise is to practise answering questions from past exam papers. It makes you focus on a particular topic, helps you to understand exam questions and can improve the accuracy of your answers.