GTO: Great Teacher Onizuka (1998)

Also known as "Great Teacher Onizuka." A former juvenile delinquent, Onizuka, finds himself thrust into to role of a high school teacher, facing students who behave just as he used to and the school's administration that doesn't trust him. Using the brash and unorthodox methods he picked up in his youth, Onizuka manages to reach through to his students and help them with their problems.