Well, I'm going to have to give my olde speech.
Screwing around with school computers is a very dumb idea. You can get expelled, ruin your education, ruin your life, and for what? Nothing. School isn't a game, and messing with school computers isn't a game. It's just a plain dumb thing to do.
For example, look at Cuphead. He ended up spending time in jail, and got expelled from school.