Carry mace, pepper spray. It won't get you locked up and it will easily put these pusillanimous individual motherforgeters on the ground.
Also carry a knife for when it gets real, which it may.
Tell the teachers what happened and lie as much as is necessary to make them side with you, just so if stuff happens they will be predisposed to believing your line of ghetto drama stuff.
Also, you can burn some stuff down with an easily obtained lighter.