Don't, and I mean DON'T try to study beforehand. Not only is there a risk of learning the wrong stuff, but even if you studied the right stuff, you will be bored silly in GS. Seriously - they teach you EVERYTHING you need in GS. The only people I know of that have busted their initial rides are the ones who studied another company's systems...

Congrats on your class date! You're gonna love it...welcome to the Zoo Crew!