We learn that Homer never finished college, or even went to college for that matter. So he goes and has to pass so he can keep his job at the Power Plant. He meets three nerds named Gary, Doug and Benjamin, but they are such nerds Homer tries to get them to change. But he inadvertently gets them kicked out of college. Now he must try to pass his class and get his new "friends" back into college. In the end Homer fails so he needs to retake the class.
A very hilarious episode with a very interesting plot. Perfect