Red, Black and Blue

I originally wrote this for a school assignment. I was asked to write a dystopian short story based on high school life.
It turned out as more of a "micro-dystopia", as the dystopian elements occur mostly within the school presented in the story.

Any comments/feedback is appreciated, I'm mainly concerned whether or not the text is spaced properly and everything is grammatically correct.
This is one of my first stories, please judge as harshly as possible.