Nana Maru San Batsu
English name: Fastest Finger First
Type: TV, Episodes: 12
Aired: Jul 5, 2017 to Sep 20, 2017
Studio: TMS Entertainment
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
As soon as he entered high school, the first year student Koshiyama Shiki was invited to the mysterious Quiz Study Group led by his senpai. What will Shiki run into when being dragged along by his class mate Mari into the dazzling world of competitive quizzes?!

(Source: Comic Walker)