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To dream that you are at a graduation represents your achievements. You are successfully transitioning to a higher level and moving forward to important things.
To dream that you do not have enough units or credits to graduate suggests that you are not giving yourself enough credit about your successes and achievements. You are short-changing yourself for your accomplishments.
To dream that you forget your graduation means that you are not mentally prepared for the next phase of your life. You are subconsciously trying to hold yourself back.