Jackasses and Nerds (1988)

After her mother losses her dog, Simone, in protest against her mother, cuts her hair. Now, with a boyish hair style, Simone, attends her new school, where her teacher mistakenly calls her Simon. From that moment forward, everyone in the class assumed Simone was a boy. With one girl falling in love with Simone and Simone falling for a boy, who thinks Simone is his rival.