At the moment, I'm doing mind maps - I find them really useful because I just put little trigger words & statistics on them. Oh, and highlighters help, just highlight really important info, that when you just want to revise quickly, just scan over them and voila! Past questions in timed conditions help too. But remember, everyone has revision techniques that work for them individually, so whereas I can learn from mind maps, others would prefer just reading from a text book etc. etc.