A - elite class. B - normal, well-rounded guys. C - nerds and dullards. D - a bunch of hooligans.
I had the same experience. And we also had a "D" class, for slightly slow learners and others, and they were even cooler than the "C" class.
Except I wouldn't say that the "D" class was just slightly slow.
And that "B" is well-rounded. "B" was us, and we were always the craziest and most restless class. Top of the whole school.
And "C" - yes, a little nerdy, but we had some good guys there, sociable, smart, nice, and all that. And some cool girls too :)
Added after 38 seconds
Arko, how do you like it? :)