In the pilot episode/series premiere, Itsuki and Miku think out loud complaining that their tutor is a student in their own school and year level, instead of a graduate of a bachelor's/associate's degree or even just a high school diploma.
Itsuki: Why you? You're in my class. Is there not even one proper tutor in this town?
Miku: Why you? You're in our grade. Is there not even one...
This is an extremely reasonable complaint and, apparently, in the manga, there's an explanation for it:
The quints' dad and Fuutaro's dad know each other prior. And some other stuff.
- Do they ever ask their dad about it? Like call and say like
'Hey dad, you didn't mention our tutor is a student in our own school and year level, instead of a graduate of a bachelor's/associate's degree or even just a high school diploma. What's up with that?'
- And actually why doesn't their dad just inform them in advance? Like
'Found a tutor for you guys. Tutor is in your own school and year level, Fuutaro Uesugi. I'm choosing someone from your own school and year level instead of someone with a bachelor's degree or even a high school diploma because [insert reasons].'