Well , it is High School so ... I've been wondering about making it really like one eventhough it cant be...if you get what I mean..., so here is some ideas of mine:

Peoples we need :
Principle
So we can like discuss with him/her with somethings . Hopefully not going to the Principle's Office for scoldings...

Advisor for clubs
We can make other clubs your excited about and we need more Advisors as well...

More Teachers
Just for teaching ... Unless we play two characters ...

Events:
Fireworks Event
Japanese Festival
and lots more which I cant think of...