Actually, with an admin that knows his/her stuff, you shouldn't be able to defeat the proxy. Your only hope is that it's not a content filter but a site filter (meaning that it blocks places by site, not by what's actually on the page). Then again, a high school... chances are the admin (probably the AP computer instructor) is an idiot - likelihood there is high, in this country (as they say, those who can, do - those who can't, teach).
