Heathers (1989)

Veronica Sawyer tries to survive at Westerburg High by aligning herself with the dominant trio called “The Heathers”. However, when she meets JD, a brooding new student, their mutual dislike of the social elite escalates into something more sinister. As their resentment escalates into violence, Veronica must confront how far she is willing to go to escape the hierarchy she once helped to maintain.