Lines I love: "I think this class might've become English when I wasn't paying attention. Whoops, now its science." "There's a poster of a tiger on the wall in this room too. I wonder if he's related to Stephen." "There is a tiger poster on the wall, I shall call it Stephen."

So this was no doubt random, and strange, and weird, and sort of confusing. But it's also poigant and simple and interesting and quirky and I like it. I can relate to a lot of these thoughts, especially because Tuesdays have always seemed mundane to me. If I were you, I'd add a spot more detail, but it's really fine as is.