Carefully recall the scene in the dream.
If it is an exam, it means competition. In fact, people's feelings in the competition were as early as the exam.
If you meet a classmate, it is an unfinished relationship with this classmate, which may be resentment or reconciliation. There are many kinds.
Anyway, feel for yourself. Life is a continuous process, from past experience to the future. If some past experience is immature, it may hinder future development. So I will go back to my past dreams, re-experience and form an experience.