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this worked when I was in high school, access blocked sites - use a web browser on a flash drive. like Tor. or you can copy the tor proxy settings and apply them to whatever default browser is on school computers. works even with the most restrictive internet blocks.
One method I used to use was getting a .co.cc domain and a free webhost and hosting a proxy. Set up like 3 of them and you're set for a while. Another way would be SSH tunnelling if you own a server. I tunnel all my traffic at Uni just because I don't trust any network that isn't my own.