Class Act (1992)

Duncan Pinderhughes (Christopher Reid) is a nerdy straight-A student with no social life, and Blade Brown (Christopher Martin) is a tough bad boy with grades so low he has little hope of graduating from high school. When a fateful mistake swaps their permanent records -- and thereby identities -- they decide to take advantage. Duncan will raise Blade's grades, and Blade will show Duncan how to be cool. However, they both start to realize that their new lives aren't what they expected.