Taking a quiz or exam in a dream can be a type of initiation to examine whether your beliefs are serving you in a productive way. If you are late for the test and therefore fail, your own insecurities are undermining your ability for success. A person doesn't succeed in life if they believe they will fail. Failure is a prerequisite for success. All accomplishments are achieved after a series of trials that include missing the mark. If you have suddenly forgotten what the material is about, you are being given the opportunity to let your old way of thinking go.