Unpredictable obscure mid-80’s revenge/horror

Four outcast high schoolers in the Northeast play a prank on their biology teacher at her home on the weekend, but the fun turns into murderous trouble.

“Hell High” was shot in 1985, copyrighted in 1986, but not released until 1989. It’s also known as “Raging Fury” and “Real Trouble,” which are more accurate titles. I was thinking it was a slasher, but it’s really high school thriller/horror meshing the milieu of “Carrie” (1976) and “Christine” (1983) with the revenge exploitation of “I Spit on Your Grave” (1978). It only cost $188,000,... read the rest.