Dream about forgetting exam is an evidence for some sort of relief. Perhaps you are trying to incorporate a decision into your own life. You are breaking an old image of yourself. The dream signifies an aspect of the past that still lingers with you. You may be breaking out of your shell and being comfortable with who you are.
Forgetting exam dream states concern and worries in some area of your work. You need to take time for yourself and away from the stresses of your daily life. You need to get in contact with someone. The dream suggests a decision that you need to make in your life. You are over compartmentalizing things.
If you dreamt about forgetting exam:
Take care of the basics today. Don’t try to get ahead of yourself in order to prove to someone else that you are further along than you really are. This will only set you further back in the long run. Start at square one and work steadily from there.