Make revision notes on small cards so I can carry them around and flick through them, say out loud or type up what I can remember, test myself on vocab for French and Spanish, re-read texts and learn quotes for English lit and do essay plans and past papers.
I follow the syllabus and make cue cards on all the points, then for instance for politics, I put example questions on the bottom and bullet point answers,so I can see them at a glance.