Apart from actually doing just school stuff at school, you could try proxy websites (which act like a middleman between you and other websites).
Apparently, Cyberoam's safelists aren't perfect and they do allow access to certain proxy sites. Note however that there is a (huge) security risk involved: all your personal and authentication information passes through the proxy, even when using HTTPS. Just don't go to bank or creditcard websites ;) Or PayPal, for that matter.
According to some video on Metacafe, ninjaproxy.com is generally not blocked by Cyberoam
Apparently, Cyberoam's safelists aren't perfect and they do allow access to certain proxy sites. Note however that there is a (huge) security risk involved: all your personal and authentication information passes through the proxy, even when using HTTPS. Just don't go to bank or creditcard websites ;) Or PayPal, for that matter.
According to some video on Metacafe, ninjaproxy.com is generally not blocked by Cyberoam