GTO: Great Teacher Onizuka

Onizuka Eikichi is an ex-bike gang leader who has but one goal, to become the greatest teacher. While doing his teaching internship as part of his studies to become a qualified teacher, he ends up in a delinquent class and learns of the possibility and necessity of the power and respect gained from one's students. Due to a mishap, after graduating, he gets a job at a prestigious private school to handle their 'problem class' that made the past few teachers quit. He must now handle a different kind of trouble when the trouble-makers include some of the smartest kids in Japan who prefer a more "intellectual approach" to torturing their teacher. Onizuka must slowly win his students over and deal with their distrust and hatred towards teachers and adults while handling the distrust of his fellow teachers who feel him unworthy of being a teacher.

Synopsis from Anime News Network