movie set in a private school

I think the movie is made in 2000s or takes place in like 50s or 60s and in a school.
I remember that in the school there was a rule that if a student did something wrong he had to fight the two senior student and usually the two older student beat the poor student who had to fight them.but one time the main character fights the two and defeats them.
He also had a friend that fought the two guys and lost and left the school but I think they met again in the end of the film.
in another scene the main character was tied to the ground in the cold weather at night by the other students and left there.

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