A Different World Season 6 Episode 14

Whitley takes a job substitute teaching for an unruly remedial class at a run-down junior high school. The students are completely out of control the first day, then suddenly behave themselves perfectly. Whitley discovers that they all purposely failed their tests. She considers giving up, but instead challenges the students to prove their intelligence. At the principal's suggestion, she uses her own background to cover the material left out of the outdated textbooks.