It's obvious enough, but start revising early. I learnt to do this the hard way after suffering the ill effects of cramming. I find repetition is the best method, but study from a variety of sources, because ploughing through the same pile of notes is demoralising and monotonous as hell.
Acronyms are good, but don't have too many, because I made up about 20 for a broad range of subjects and it got confusing.
Also, always do practice papers or questions, otherwise you get no practice actually bringing your knowledge together in some sort of structure.