A Different World - Season 6 Episode 14 : To Whit, With Love 1993

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 At the principal's suggestion, she uses her own background to cover the material left out of the outdated textbooks. Dorian finally asks Lena on a date. He stuns her by revealing that he does not believe in pre-marital sex. She decides that she is still interested in having a relationship with him.