The only other way would be to hack it and trust me, you don't want to do that.
A) It's illegal and will have you kicked off the school network, probably suspended and almost certain brought to police attention
B) My TAFE teacher is like a networking expert and tried hacking his own (also NOT illegal on your own) which was WPA2 which is what your school probably is and at 8 hours he still hadn't cracked it.
. How would you find out the password besides asking an administrator or password?