If your school dreams are centered around a particular place, such as the cafeteria, it may symbolize that something is extensively bothering you. It also tells you that you haven't addressed the issue yet, and it is 'eating you up on the inside.'
They might also be a symbol of social anxiety and hesitance of partaking in social events. To narrow down the dream's specific intent, it is helpful to pay attention to what is happening around you in the cafeteria.
It might also help in pointing you in the right direction to understand and tackle your dreams better.