I don't understand how I got an F

The first sim I ever sent to university also failed one course in her second semester for no apparent reason, and had to stay for a fourth semester because of that. She, too, had done everything the course asked, except for that one time she showed up late for class because I forgot to watch the clock and the autonomous "go to class" action didn't come up for some reason. Failing the entire course for being late once seemed a little extreme, especially after she was caught handing in a plagiarised term paper in her first semester and still passed that course with a D, but it might very well have happened because she handed in the term paper too early. I didn't really pay attention to that back then, but I guess it makes sense that the university would be suspicious of a term paper that was written and submitted before classes even started.

She repeated the course in the third semester and passed, although "only" with a B-, the second worst passing grade she received apart from the aforementioned D. I suppose the subject just wasn't her thing.