My advice, take a dead fish, mash it up, and put it in his backpack. Or an orange or grapfruit. Put it in there, smash it, and his shit will be so sticky. You know, an eye for an eye.

If your mom can't afford it, that's not her fault. Things cost a fucking fortune these days and I bet she works hard for that money, so don't be pissed at her.

Maybe, just clean up the mess, and if your notes are ruined, maybe re-write them or something. Getting pissed off isn't going to clean that apple up. Just clean it, get an equal revenge, and move on.

Life will get tougher than a smashed up apple, so get used to it.

Peace