Okay so my friend kinda explain to me how the classes in Japan works.

Class 1: ill boi u should study hard and pls don't fail all ur subjects again

class 2: not that bad but pls work harder

class 3: Oh you're doing fine :)

Class 4: A good, smart student

Class 5: OMG YOU'RE LIKE SO SMART

Class 6: where the hell did you even get that brain?!? its like omg u can juz go to university now

Class 7: legendary class where you're juz so smart and I'm crying because I'm not lmao

So basically that's it...

And after that I've searched Haikyuu character's class

Class 1: Tanaka, Hinata

Class 2: Kinoshita, Kiyoko

Class 3: Asahi, Noya, Kageyama

Class 4: Daichi, Suga, Ennoshita,  Narita, Tsukishima, Yamaguchi

Class 5:omg Yachi

These are Karasuno version and I'll continue the other schools in the up coming chapters xD cause I'm lack of ideas hahaha pls forgive me

And the thing I'm gonna highlight is

YUJI TERUSHIMA

THIS GUY HERE IS IN THE LEGENDARY CLASS 7

ITS LIKE HE'S SUPER SMART OWJEJEJANDNKDLALLAFJDKA

okay I'm shocked and I think you are too or its just me heh