It is probably a very common theme to dream about upcoming exams and not having done any or enough revision. At one time I repeatedly dreamt about catching trains to Devon. Both probably are easily explained.
In recent years, I dream of being at work and about to retire again. Usually I am wondering how I am going to manage (again) on my pension. I have been retired now for almost 8 years! I have no idea why I dream this!
In my current state of health there is no way I could work again. Apart from my health issues, I am very happy to be retired and I have no wish to return to a job.