WOW there were a lot of 'A' names in that little classroom, huh!? What are the odds?
Looks like just a bit of funny writing to me.
There were no Cs and Ds though. 30% of the class is A. I mean its possible lol.
I assumed this was a "homeroom" class of sorts. Many were done alphabetically, so one room might have all As and Bs, the next Cs, Ds, Es, etc.