For the Classes...
Instead of separating the rooms by continent, can we just put it "Classes" Or "World Classes"?
And then the Teachers will just put their classes as their topic in side of it, of course. That way, students won't need to go to those continent classes, things? They don't need to get out of the room to their home page, all they need to do is press the 'back' button and click for their next topic(class, in this case)
I think the teachers would be confuse as well, where they put their classes and such. This way too, it prevents confusion and way easier to navigate. The fact that it is a school, students shouldn't be separated but united... And they should know one another in the class room.
You don't have to change it if you don't agree with the idea.