Ma'am May We Go Out? (1985)

Soriano brothers Dennis, Chipipoy/Chip, and Jeff are bums who do odd jobs to earn a living, including driving a jeepney. Their lives take a different turn after meeting Atty. Aga Agaton, who tells them that they're long-lost heirs of a US-based millionaire. The millionaire's will says they will claim the inheritance as long as they finish high school--if they don't, the lawyer will take it all. The brothers enroll at the Rajah Putih High School, where their age turns them into the butt of their classmates' jokes. The brothers eventually befriend a group of students after saving them from thugs. They also seek help from Einstein, the class' resident genius, to try to pass the most difficult subjects.