Dream About Being A Graduate Student at A University - A Confusing Experience

Last night, I had a dream where I replaced someone else and became a graduate student at A University because that person had the same name as me and scored better than me in the exam. At first, I felt very lucky, but during one of the exams, everyone else got high scores while I only got 56 points. I felt ashamed and embarrassed, but my teacher comforted me and said it was okay. I started to feel anxious, thinking that I shouldn't stay at A University and began to fear if my actions were illegal.