You take the book with you as the bell to the next class starts. You take your seat in the center of the class where all of the other students you associate with come to sit around you. Basically there were a bunch of stereotypes of different students who are in all of your classes when you go to every single one.
There's the goth girl, the girl you have a crush on, the nerdy fat girl, the obsessed popular girl, the chess team captain, the class clown, the juvenile rocker, and the school quarterback. You think there was going to be a lot of fun with the people you were sitting around in class with, so you decide to change one of them as you think of a best punishment of how they treated you. So with that in mind, you open the book, and pull out a pen to who you should change first.