I recently watched Massacre at Central High (1976) in the outstanding Blu-ray/DVD package from Synapse.
This is a unique low-budget horror film about high school students. A new student at Central High finds that the school is run by bullies, one of whom is an old friend. He challenges the bullies who cause him to have a crippling accident. He takes revenge but finds that the oppressed students (the fat kid, the nerd, the pot smokers) are no better now that they are no longer intimidated. There are no adults in the film until the end which is at a high school dance.
Synapse includes a long extra with new interviews of actors and others involved with the film.
Sad! 