High School 
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.
Barbie Doll
Dreaming of a Barbie doll may be a sign that you are holding a superficial view in a personal situation that may thwart any true and satisfying progress. To dream of broken or dismembered Barbie dolls shows that you are led by your unconscious back into your childhood to where emotional maturity was stunted. There is a message here to meditate on the Barbie doll and what that means to you personally.
Kindergarten
To dream of going back to kindergarten indicates a need to reconnect with your inner child.
To dream of being afraid in kindergarten indicates that your inner child may need to be comforted and supported. Memories from your past which have made you feel shy or insecure may be causing you trouble in the present.