Not going to lie, I was dead tired and pretty drunk when I read the first two-thirds of this volume. Happy Juneteenth, as it were.
This volume kicks off with Mutsumi's grandma or whatever helping Taiyo uncover some power or something, by opening a super-secret book that I can't remember if we saw anything of. Then began another exam arc. Three proctors, all being Yozakura siblings. I do not remember how Shinzo or Futaba were defeated. The Kyoichiro battle I was sober for, reading it the next night. It was pretty good. Taiyo gets a power-up through Tsubomi. Maybe he used this against the scientist guy earlier, I don't remember.
I should probably actually just drop this, but I'm stubborn 乁 ˘ o ˘ ㄏ
Btw, VIZ are doing that thing where they don't know if a character is a boy or girl so they play it safe with "them" because this is America and we can't just go out and ask a (fictional) person's gender.