Help me name this movie!

Everyone here seems to know a lot about 80's movies so I thought u could help. I saw this movie as a kid and can't remember the name. Does someone know it? There were two groups of high school kids, one group of boys and one group of girls. Boys were rude to girls so a nerdy boy dumped garbage in their car but got caught. The boys forced the nerdy boy to rape one of the girls in a school bathroom. The girls retaliate, then the boys retaliate, killing another of the girls (I think she was walking and they forced her off a bridge or cliff with their car). Finally there is just one girl left. She lures the guys to a junkyard, then picks them off one by one with a bow and arrow (and maybe other ways too).

Sound familiar to anyone?
Thanks