@Luke_chase I think he did it because Machida's the same age as his daughter, to try to get better at talking with someone that age. Plus it's already been said that he's immature for his age so he might relate to highschool kids more than working adults.
@Luke_chase She said the guy's in grade 3 (I assume they mean year 3 of university) while she's probably year 1 I guess judging from that flashback when she talked about how Himeno couldn't sleep alone as a kid,
I'm pretty sure she lost one point in math on purpose so he'd get the position.
@Tatherwood It's scored out of 100, so him getting the best performance won't really matter as long as both are considered enough to receive full marks.
@raeastoria I remember when I was 11 I was in a split grade 6/7 class and there was one grade 7 (so 12/13) girl with boobs. I dunno how I still remember that, but it must've left an impression on me.