This is cute! Personally i find the font really hard to read quickly, not sure why. The math I think would be a little more fun if the buttons for the numbers were in a 2x2 square instead of a 4x1 row. I really enjoyed the increasing time pressure mechanic though. Otherwise it's just the basic tycoon stuff, which I've never been overly fond of, and thematically buying students and selling failing report cards is really goofy but I think in a charming way :)