Work out which parts of the subject you don’t know. Remember you might know some already and may need to concentrate more on learning the things you don’t know.
Make flash cards for things you don’t know or areas you have identified you need to know more about. Get people to help you learn and remember them – sometimes this makes it a bit more fun…
Make sure you have the revision books and prioritise revision in plenty of time.
Know when you exams are – have this somewhere clear and visual. Make a timetable to break down your work into chunks which are realistic.