Why/how some people are just so unorganized?

I just don't understand how there are people who don't live , study or work in a simple and organized way. I have friends in college who tell that they can study right before the exam so they don't study, most of the times they fail the exam.

Or people who are not going to somewhere on time, is staying at the dorm better and more productive? I know this post regards a younger audience, but I am really seeing it difficult that these people from my generation in a progessional setting at the future.

Maybe I am very obsessive about it but I always try to do everything on time in a planned way, why those people are complaining when their things not go well ? Like, you were not motivated at the first place. Such a lazy cope