I wonder if this is unique to us engineers, because that's almost the same as mine! And it's always an advanced calculus class, and I haven't studied all semester.
I don't recall the exact class [differential equations ?], as I haven't had the dream in years, but I can clearly remember running the halls of the math building, looking in rooms in vain.
For years (10+) it was a dream I several nights a week.
Now why, in the dream, I was cutting a class that caused me trouble, is probably a question better left to a psychiatrist.