A dream that you are taking a test or an examination often means that you are performing an assessment of yourself. You are thinking about how well you have performed in past situations in your life, and how well you will deal with situations in your future. You may be comparing yourself to other people that you know.
If you dream that you aren’t prepared for a test or an exam, that you arrive late, or that you don’t know any of the answers, you are afraid of failing at something in real life. You may have been placing too much pressure on yourself.
A dream that you are taking an exam can be a sign that you need to consider the expectations that you have of yourself. Perhaps you are being too much of a perfectionist or are demanding too much of yourself, and you need to learn to accept and to appreciate yourself as you are.
On a positive note, if you dream of passing a test, your unconscious could be assuring you that you have every right to feel confident about your abilities.