im calling it now.
Mananu is gonna fail at getting into tokyo uni despite his "best" efforts including going to cram school and now having a support group in yuuki and childhood friend / ntr plot device ryouchin. Megumin and Yuuki are going to pass into getting where they want to go university wise respectively (yuuki with her good scores, and megu with her sports achivements)
what does this mean for manabu? aside from the fact that going to tokyo uni just to be a teacher (or something along those lines) is such a waste. i think it will make him reflect on why he even decided to do this in the first place. did he not want to become successful academically and get into tokyo uni all to impress his "crush". (and i say that in air quotes because we all know he truly likes megu more, and its been a while since we last saw mikawa). Manabu will realize then (at least, i hope the author hopefully takes it this way) that failing is a part of being human, but it makes him worth no less as a person, and he of course still has the support of megu, his friends and his family. i then think he will pursue what makes him "happy", whats been in front of him all along. Tutoring / teaching others and of course, being with Megumin as well. they inspire each other to do their best at their respective fields (ecchi gags aside).
As for Yuuki and ryouchin, i believe the typical trope of "not valuing what you had all along in front of you" will be how it plays out. after seeing manabu fail at getting into tokyo uni but still going forward and doing what he wants (what he admired from him instead of ryouchin). Like i said, i suspect ryouchin failing as well to get into tokyo uni as the author has shown how similar attempts have gone for him in the past. And, to put it simply, Amano and Megumin is the ship that was destined from the start.