It's not wise to get ahead of yourself, you are given plenty of time to learn what you need to know. If you sit there with a pile of books in front of you, what you read will have no context. Memorizing things in advance, with no context or direction, is more likely to bite you in the *** than help.
Ground school is dead simple, it's straight forward and the review material for the tests is solid, nobody fails ground school (and if you do, you have no business in an airplane). The flying stuff is very procedural and specific, not something you can pick up just flipping through the book.
If you want some general review, flip through the "From the Ground Up" and the "RCAF Weather Manual", but I'd highly recommend against memorizing circuit procedures and power settings before the course.
Just my 2 cents...