I dreamed of an exam and was asked by the teacher to do the problem.

As Freud said: Only those who have passed the exam will dream of failure. The reason why the landlord had this dream is because the scene at school left a deep impression on the landlord's heart, and later graduation will lead to these inner shadows and dreams.

As for the reason why the landlord had this dream at this time, my understanding is that the landlord is doing something he has no confidence in at work or in life recently.

Because the landlord in the dream is very difficult, when the landlord wakes up and finds that it is a dream, he will definitely feel very lucky and confident (all the hurdles that were so sad before have survived). It is through this dream that you can have some positive psychological adjustments, so that you can better face the current problems.

The above is my personal speculation. If what I say is wrong, the landlord will be a joke, so don't take it amiss.