I've only done one uni exam and i just went through each page of the lecture notes writing out in a seperate book the important concepts, and then going through a full practice exam, and when not knowing something looking up that concept in my book and going from there. Then before going to bed trying to memorise the ROTE learny stuff (there was quite a bit for inorganic chemistry).
I crammed very much the days before the exam, and did nothing all year, but this could help for concepts you don't know too well I'm sure but try and spread out what you need to do, and give yourself plenty of time to rest in between.
if you already have studied throughout the year (which is what you/i should do) then make notes on anything forgotten at the end and do practice exams using that note book as a reference.