As for the elective classes

"Kita5399;c-17649237" wrote:

"Jeansoo;c-17648083" wrote:

"Kita5399;c-17647832" wrote:

"Sketch793;c-17647701" wrote:
Your Sim probably failed one of his classes if he didn't get credit for it. I've had many Sims attend university and take electives. Their electives have all counted the same as the core classes. This includes one Sim who has already completed six degrees and is halfway through his seventh.

Failing will cause you to lose the credit for that class for sure. I find it’s easy to fail electives because often they use skills you don’t yet have. In order to pass, you have to complete all coursework and attend classes. That is enough if you started with a few skill points, but you need to make sure you have around 4-6 skill points to pass. If you started with 0, then you may end up with only 3 after all the work is done. The best thing to do is email your professor about 3 days before term ends, and if they say you’re not doing well it will give you time to raise the skill needed.

In case of my sim, he was the first sim enrolled in university. I wanted to have a look how the system works in university, so i picked him as he had 10 skill points with every skills. I didnt want to fail, so i had him study all through the night even though his skills were maxed. But he didnt get the credit from the elective class even though he had A+ with it. Now i can guess he definitely got a bug with the elective class.

I think there is a bug with this, I remember it being reported when the pack came out. Something to do with the game not recognizing progress, due to all the skills being maxed out.
Here is the bug report, it sounds similar to what is happening to yours.
https://answers.ea.com/t5/Bug-Reports/OPEN-DU-Sims-fail-university-despite-meeting-all-criteria/m-p/8544843
The OP of it had theirs actually fail, but there were a few comments after that sound more like your issue.