Clueless (1995)

Shallow, rich and socially successful Cher is at the top of her Beverly Hills high school's pecking scale. Seeing herself as a matchmaker, Cher first coaxes two teachers into dating each other. Emboldened by her success, she decides to give hopelessly klutzy new student Tai a makeover. When Tai becomes more popular than she is, Cher realizes that her disapproving ex-stepbrother was right about how misguided she was -- and falls for him.

Tags: based on novel or book, cheerful, coming of age