Well id agree with everyone that a proxy would work well if you can find one that works.
But most schools if they have a proxy set up, you can get in trouble for byassing it.
Happens all the time in my school, People download freegate and BLAM! suspension.
If you can get on download.com, and download you should be abl eto get freegate. Dont use it myself, but i dont use the internet at school for much more than check on some web comics, and conducting random searches.
If your gonna use a proxy make sure you wont get in trouble.
If so my school has coolmath. Kinda lame, bloons tower defense is kinda fun and coolmath shouldn't be blocked.