Is it normal to have recurring dreams about failing a college exam?

I keep having recurring dreams about failing an exam in college. I'm always in the same classroom with the same professor. I remember this class for how difficult it was and how nervous and stressed it made me because I was afraid of failing. Every once in a while I will have a nightmare about being in the middle of an exam in that class, I look around and everyone seems to be halfway done but I can't even answer one question because everything looks so confusing and complicated to me. Usually inside the dream after a few minutes of this terrifying torture, I will force myself to remember that I already passed this class and graduated. After I remember this, my dream sort of ends. Nevertheless, a few weeks later I will have this exact same dream again.