at study hall, you should have walked up to the teacher and told them exactly what happened. Then the school would have taken care of that asshole that day with no worries from you. I second the notion of telling mom exactly what happened and getting him and his parents to pay for it. yeah it's funny, haha now give me $50 for my books dickhead.

who laughing now?

and stop the dumb ass testosterone laden notions of getting him back some way, that's fucking stupid and will only escalate into more dumb shit you or him will end up paying for. (and since your mom is broke, lets not stress her out anymore with boyhood shenanigans) Just let it go as something extremely fucking stupid that he did that he gets to pay for now. Lesson learned here...leave physical comedy to the pro's.