Class Act (1992)

Duncan is a genius straight A student, Blade is juvenile delinquent. But because of a mix up with their school records, everyone thinks each is the other one. Now, Duncan kind of likes the attention from being thought of as a real bad dude, if only the school bully would stop trying to rough him up. And Blade definitely likes being thought of as important instead of as trouble, if only the teacher would stop hitting on him for a date.