To dream that you are in the school, means that you are not fitting into todays society standards. You do not trust yourself as an adult and the person who is capable of doing whatever he wants to do. If you are the one who teaches others in school, then you are a very confident person and wish to share your knowledge with those around you. The school is also a symbol of the good times you had in the past and perhaps you are missing the days without any responsibilities.
Read more about dreaming of School in other dream meanings interpretations.