[ level? does that refer to grade level? in that case is it somehow only the upperclassmen around ada's age wear the white and the younger ones wear black, instead?

he leans forward, squinting a little bit as if he can get a better look at the screen image. uhm??? ]

....I don't see much of a difference and I've seen a lot of girls in white uniforms today. [ not by choice, mind you. not by choice at all. ]

...So, you're a prefect—

[ so is ada, but maybe they don't mingle. who knows. ]