First, my apologies for being so critical of the Sims 4 Devs. I reacted out of, well, anger. I do believe they try their best and they indeed deserve much credit for the amazing sims 4 game. I admit sometimes i'm in awe of some of the things I observe in game and think of the amazing creativity and talent of the sims 4 Devs.
To recap some things, my sims attend all classes, or at least I assume they're attending classes. They do all homework assignments. They go to class with all needs fulfilled. They also go to class with focus mood. They do all their projects. I noticed some people say don't do the projects until the very end of the semester, which I don't get why it would make a difference when you send in your project, as long as it's done. Because I always do the projects at the beginning and yes, then I submit them. Also, their research and debate skills are maxed.
In reflecting on the suggestions you all have made, I thought about what might have triggered these failed grades and probation. I don't know if this is the reason for the situation, but I did rotate to another family on the weekend that there were no classes for my University sims. When I returned to my Uni sims, in time for class on Monday morning, the messages appeared that they failed their classes and were put on probation.
Regarding the ping pong table, my sims will just stand in front of it for quite awhile, waiting for another sim to join, which most times never shows up and then messages appear saying the ping pong session was cut short due to lack of participation. And the ping pong drinking game just seems rather "lackluster". Also, I don't get what the point of a keg drink is. It just seems to be the same effect you get from a bar drink, which is a little moodlet.