I have this dream constantly. Always that I forgot to ever go to the class, never that I'm struggling in a class or that I'm going to fail I class I've been attending. I wonder, did you skip a lot of classes in College?
Hah, I don't think it depends on that really. I've never really missed classes in college (mandatory attendance yay!) but I still get those dreams occasionally.
It's funny to know this is a dream theme that others have. It's not the only recurring nightmare theme I have but it's a major one. You're right that it's just that I forgot to attend or something, like I just totally forgot I was enrolled for the course.
In my case, there's some real-life precedent for it. I enrolled in one course in undergrad, and dropped it right away my first week or so for some reason I don't recall. Toward the end of the semester, before finals, I found I was still enrolled, but had never set foot in the classroom or anything.
I was sort of panicked, but went and talked to the professor, and he was fine with it. He basically verified that I never did anything with the class and it was somehow deleted from my record completely.
I still don't know why it wasn't dropped in the first week, although this was before electronic registration systems.
I've had that a lot for years after College. During College, I skipped a lot of classes and instead studied by borrowing books from the library, it worked well in terms of learning but it meant that if I failed my exams, my teachers would probably not hesitate to expel me. That added a lot of pressure and is most likely why I've been having that dream regularly since even 15 years later.
I’m not the person you are asking but I got the same type of dreams, and yes I practically didn’t attend to at least a quarter of the classes in college. I didn’t like some lecturers, so I would study through textbooks and ask my friends about important exam dates and would generally have fears about missing these exams but somehow I still have these type of dreams.