1. Start early
2. Make a revision timetable. Avoid wasting time re-writing this over and over again.
3. Answer questions from past papers.
4. Identify the key points, examples and evidence for each topic - you will not be able to write very much on each in the exam.
5. Prepare for questions that combine two different topics.
6. Prepare for unusual questions or angles for your 'best' topics.
7. Go over the same material quite quickly several times rather than spending a long time on one occasion.
Sources
The Study Space
Revision strategies and tips