You know, it's still hard but not that hard anymore when you finally figure out that students have to be enrolled manually. That's why you should always read instructions.
This time, I managed to get the prosperity to go up. Couldn't finish all the way up to 100% because my lunch break was over but it's a nice game. I hope you keep improving it! (It would be cool if the school you currently have selected would be highlighted somehow for example)