Medaka Box - Vol. 22 Ch. 187 - The 100 Flowers Run

[MangaDex]

 

[Froshi]

Isn't the C-Note on the 3rd page wrong? Maru (O) is actually considered correct, and batsu (X) is wrong.
I think you confused it with the check mark actually meaning wrong/incorrect when marking exam papers, because the check mark (/) is basically the short form of batsu (X).

 

[Levankua]

Squaring up and getting clocked by your gf lol. Best couple.