I was hanging out all by my lonesome when my random stream of thoughts carried me to the only time I ever had an art teacher*. This led me to think of my years in the finest school I ever went to, which I jokingly referred to as my "Yamaku experience" due to my relatively tranquil time there (despite the lack of disabled students, funding, et al., it was a small and secluded school of almost sui generis predisposition). That thought and the school's microscopic size led me to think about Yamaku's student body, structure, etc. I'm sure Yamaku isn't a small establishment, but its scale is never exactly described as far as I remember, and it's not like we meet that many students to begin with.
Which leads to the topic in question: What is the size of the Yamaku student body and just how expansive is the school property itself?
I'm willing to bet someone can conjure up mystifying numbers by calculating the grades and classes or something. I'm horrible with math, so feel free to enlighten the math-dumb.

Feel free to talk about the Japanese education system too (in contrast to Western ones) or other related stuff, I don't know. I ain't picky. Besides, it might offer good research for aspiring fanfic writers who don't know a thing about that subject.
Apologies if this has been answered or previously posted elsewhere in advance, if it has I'll take a link to that answer and run off somewhere—probably back to the fanfiction board.
* I know what you're thinking. Don't worry, the teacher was nothing like Nomiya; he was in shape, for one, wore a ponytail and looked rather French or Italian, although it's possible he was simply a Spaniard. You know the type, probably. The music teacher, on the other hand... Oof.