Classroom management is really not something that the director spends a lot of time on. I assume this is because of the precedent he has set before. I assume he was very consistent in punishment, and always treated the students with respect. These strategies are very closely related to listening and reading strategies. In fact, in many ways, they overlap.
Good musicians are professional, ask intelligent questions, and excel in their field.
The director helps his students become great musicians by teaching them musical content through tests over musical terms. The terms are defined, reviewed in class, and then the students are tested for comprehension. They are also responsible to know the terms when they later appear in the music. The students are encouraged to compete in solo competitions. This encouragement is not only verbal, but also physical.