Sooooo I know ancient highway made a mod like this, yet I'm quite sure its been wiped off the internet because I've checked all the graveyard and more.

I'm wondering if there are mods that either remove the free money your sims get when they pass an exam in Uni, or a mod that makes your sims pay for uni

Thank yawww

https://modthesims.info/download.php?t=613939

It doesn't remove semester grants, but you can apply directly to the loan.

Remember when I said there were many SFS archived folders .. well here's the one for Simbology .. It has TwoJeffs, Jase439, AncientHighway, ChristianLov and a handful of others. I can't say if the mod you're wantin is in there as it's not one I've ever used.
https://simfileshare.net/folder/92516/

In addition to Bulbizarre's suggestion there is also the possibility of using Simwardrobes Checkbook and sendin the money to a random townie. (Check Bubls sig for link). I think you can also use Monique's computer for somethin similar.

Another suggestion which doesn't require any mods at all is to buy somethin with the amount of money you wish to delete and then gift that item to another sim or townie.