How many days do you go to school? Probably not worth buying a bus pass.
I've only got class two days/week, so I just park at the lot across from Altaib @$10/day, and you can leave/come back and use the same ticket (once you know the guy). Problem is it's so f*cking tight, that your bumpers will get scratched. Been too scared to bring my STI there.
On de Maisoneuve and st-Mathieu (a little past actually) there's another place. $7.75 for students. I like it, because there's a bit more room, so you car is generally safe. Not to mention the guy sits in the booth and watches the cars. Give him an even $10 and ask to have a "safe spot". He'll park you between a couple BMW's or something.
Cheaper and better than the POS parking meters. Or ask 250 Rocket to let you ride bitch on his bike? I'm looking forward to March 15, can always make it home in <25 mins.
PS, my car has been broken into a few times in Westmount, never in Dorval.