My understanding is as follows.
The big classroom represents your living and learning environment.
Watching cartoons shows that you like watching cartoons, and it also represents your yearning for a relaxed and colorful life.
The headmaster symbolizes the pressure and management of learning.
The somersault represents some proof of your ability, but you feel a little naive.
Playing computer at the stairs means that in your present life, more entertainment is surfing the Internet.
People who want to rob your computer represent people who are dissatisfied with your constant surfing the internet, or some ideas that you are too opposed to surfing the internet.
Putting you in a sack represents the psychology of inhibiting fun.
So at this time, you become two, one is playful and the other is conscious.
Mom saved you and showed her tolerance for you.
Animal internal organs symbolize instinct, but also have bad parts.
Your vomiting shows that you want to get rid of some wrong ideas.