Whats this movie called?

its about a tescher who teaches in this other state and decided to become a teacher in newyork.He ends up teaching this misbehaved class with bad students.Then he made rules for his class rule number 1 was we are all family and blahh blahh blahh its a good movie im watching it in school and we didnt watch all of it also theres this part when 2 boys start to fight and yea plz help