When the Simpsons visit Marge's childhood home and discover a box of her old belongings, Lisa is surprised to learn that Marge was once a stellar A+ student. After discovering that a distraction caused Marge's grades to slip in high school, Lisa fears that she will end up just like her mom unless she pledges to focus solely on academics. When Lisa learns that prep school Cloisters Academy is accepting new students, Marge puts her feelings aside and makes a secret deal allowing Lisa to attend her dream school. Meanwhile, Bart puts Nelson and his bully ways in place and unintentionally claims the title of School Bully, and Lisa learns a lesson in family and altruism.