I'm not aware of any books which are particularly good. Someone on these forums recommended a Q&A book for contract which gives you a bunch of sample model answers. A good idea certainly, but the Q&A books I've seen have been a bit naff. My advice would be to draw it out of your tutors in tutorials (i.e. ask "how would we approach a question on X"). Another good tip is to look at past papers and read examiners reports from the very start of the course. My guide to exam technique is in the FAQ in my sig.
At school, you are made to practice writing exam papers and so on many times before doing the exam. At uni, most people just read the stuff and don't bother to practice it. I'd advise making your final 2days revision for each subject (so 10days of this for 5subjects) practice/consolidation days where you practice planning and writing answers to exam questions. Practice makes perfect... and it also reveals gaps in your knowledge and gives you a chance to look stuff up before going into the exam room.