I don't know what the optimal size for a student body is, but I suspect it is 250 per grade level maximum. I also went to a very cozy school leading up to high school where the largest grade included 27 students, and this is too small, not enough diversity, particularly concerning choices when one begins dating. Should you wish to explore this. You know how Olympic skaters are rated on a 6.0 basis as perfect, or how the gymnasts are rated on a 10.0 scale. Well, in education, we should be using a scale of 5s.
Most classrooms are quiet.
Good teaching needs to be noisy at times. Most classrooms are neat. Good teaching is most often messy. Most classes are taught by lecture. There are eight types of learners, and we teach only to one.