Pep Squad.

Set in and around a small town high school in Kansas, Beth is a naive senior student who asks her two new friends, the slick and outgoing Julie, and her boyfriend Scott to help her cover up the accidental killing of the hated school principal. But they are observed by Terra, a student nominated for prom queen, who blackmails them into rigging the election in her favor. Undaunted, Beth, Julie and Scott turn to the most popular/hated student Cherry to kill Terra for them. Cherry agrees to the hit, but only if she gets Terra's nomination for prom queen and the crown as well which sets off more complications for all involved.