And examiner reports can help you with finding out what mistakes to avoid in exams.
- teaching others
- recording yourself and listening back to it
- repeating things aloud
- revising with classmates
- drawing diagrams
- making a song of it
- a silly story to help it stick
- making notes from textbook then summarising those further into your own words (try having a limit on number of words to stick to key points)
- writing things over and over again
- using colour
Make a list of all the topics, prioritise them by ordering in terms of which you need more help with/need more time to go over, then tackle each one
If there is something you're particularly stuck on, ask the teacher for help!
Get practise from exam and practise questions! It will help to reinforce things and find your weaker areas.