High school represents a turning point in life. It is a time when one meets lifetime friends, commits silly mistakes, and shared hopes and dreams. A mixture of emotions, expectations, and memories gushes out from the thought of high school.
To dream about high school refers to lessons learned and preparations made for life.
Dreaming of high school likewise brings to mind your parents' expectations from you. To fail high school indicates doubt in your abilities or accomplishments in your life, based on previous failure or insecurities you had in high school.