Different strokes for different folks, really.
I'd suggest not overdoing it, there reaches a point where you've read so much your brain hits overload and nothing is taken in.
If you can, get hold of copies of the last two or three exams and see how you cope with the questions without referencing anything.
Myself, I used to cram in the few days leading up to the exam, then cross my fingers. It usually worked
The one time I got seriously bladdered the night before, I failed, brain was a blank when I turned over the question paper
Conversely, a full night of rumpy pumpy the night before I took an exam I expected to fail - I passed. Beats me
(that was in Newcastle, btw).