Moonlit, I don't think that tunneling a firewall to access restricted contents is considered as "hacking" a school.
Once our class had to research some informations, namely caricatures about some political leaders. Someone found a really nice site, which was classified as pornography, of course it was ridicolous, there was none.
I accessed this site over my server and got the informations.
As long as it stays in that frame, which means no remote tunneling I think it's not "hacking" a school.