13th Grade (2005)

Sinopsis

Just as he's about to graduate, senior classman David Easter gets the shock of his young life when a new teacher invents 13th grade in this comedy. Their longed-for freedom threatened, David and his friends set out to make sure they graduate in the expected four years. Meanwhile, a Hollywood star who missed out on high school arrives on campus and develops a strange relationship with the school's 21-year-old principal.