|Use a Third Party Proxy...|
be forewarned, some of these sites are usually hosted by hackers and you use them at your own risk.
The other solution: Third Party VPN to your computer at home...
This is more secure because they setup a tunnel to allow you to remote into your computer.
P.S. Listen to the other poster. Chances are your school is running SNORT and will know when you log on to one of these systems.