I'm going to make my brother miss class
What is your reason for wanting to make your brother miss one of his classes?
My motive is to be mean to him and cause him suffering.
It is wrong to get in other people's way that will cause problems with them. Especially making your brother miss his class. You should not make anyone miss their class.
I hate him so much I just want him to fail.
Well just because you dislike him does not mean that you need to go about trying to ruin his future. If you hate him so much then why not just leave him alone and keep from interacting with him. It sounds more like jealousy than hate to me for this reason, so maybe putting your focus into something more productive would also make you more happy!