The History Boys (2006)

This is quite a smart film that does much more than The Emperor's Club and other prep school dramas about inspiring teachers and their disciples. The History Boys emphasizes the dark parts of the education system and of humanity - particularly their English and History profs.

A group of academically gifted boys give a small and not very prestigious British school some hope of legitimacy if they can pass their exams and enter some of the top universities in the country. As a young teacher is hired to prep them, the joy of learning begins to die as they pursue marks instead of knowledge.

Some great acting and writing (inevitable when it's based on a play).

IMDB