It reveals mistrust and fear of failure regarding the situation that you are experiencing. Awareness of this uncertainty indicates that you should trust your own skills more. Exams are quite stressful experiences that require you to deal with them in the short term. If you dream that you fail an examination, or arrived late, or did not study enough, it means that you are not yet ready for the challenges of real life. You are advised to make the greatest effort and to forget your fears. The two esoteric interpretations that exist about this dream are opposite. The first states that passing an exam portends success in life; canceling it, failure. The second interpretation, however, predicts the opposite.