Dreams of School!
Although, sometimes you may yourself teaching or leading the class at the school. And this can represent you helping others grow spiritually in the Lord. For example; It can represent a teaching ministry (or even helping to teach in children's church). Or, it can just represent ministry work in general. Also, depending on the dream, a school can represent church (since church is where you grow and learn). But again, that will depend on the context of the entire dream.