A classmate from the past is read as a reminder of who you were then and what you were learning. Dream books link the figure to comparison, old dynamics or an unfinished lesson.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.