I worked full time while doing full time university, it's hard, but possible if you give up every moment of your private life (now that Live Journal is around, I wouldn't be able to manage the time anymore). I did 'help desk' most of the time, which is a job which gives you a lot of quiet time to study in between phone calls from FUCKING RETARDS WHO CAN'T EVEN WORK OUT HOW TO REBOOT BY THEMSELVES! Ahem. Anyway.

Prostitution is quite a good money maker depending on where you live and how legal it is. My friend Kim put herself through university with stripping/prostitution, did quite well out of it. Dope dealing is also good - a few people I know and some people on my friends list got through school via dope dealing. Just pot, though, nothing really hard that'll get you into trouble.