Most people are not aware of the importance of organization. The truth is, it's arguably the most important aspect of mental functioning.
Let's take someone with no plans whatsoever. He would lead an empty life that wastes away before he knows it. He'd be indefinitely procrastinating. This would all be because his life has no organized structure to shape it.
It is directly connected to mental strength. The more disorganized a person is, the weaker his will. It also affects focus, as you can imagine. A clean and organized mind is a focused one. The best method for a student to study is to organize all the information in their minds, and practice it.
What do I mean by organization? Physical? Mental? Time? The answer is, all of them are related. If you try to fix one and ignore the others, it won't work. This even includes the organization of our body movements; you'll notice that people who walk like zombies often lead disorganized lifestyles, because they're not even willing to put the effort into walking straight. Martial arts are an excellent example of improving mental strength and organization of the body's movements.
The ability to organize and the style of the organization differs from one person to another. We can't all set ourselves daily schedules to follow, but that is not necessarily a bad thing. Each person should figure out their own methods of maintaining an organized lifestyle. The least one can do is make decisions involving what they're going to do the next hour or so; it's flexible, it's easy, and it's very helpful – even if it's not obviously so.
For example, we can set ourselves a specific amount of time when sitting in front of the TV, or a specific list of websites to visit when using the internet. If it can be done in an organized daily basis, it's better, but if it can't, then we can at least decide how much time we want to spend doing a specific activity before we do it. If we find ourselves failing, we can organize other aspects of our lives, because as mentioned earlier, it's all connected. You don't usually find someone who's completely organized in one way, and completely disorganized in another.
How this works is that organization inspires guilt when you don't do something you were supposed to, or did something you weren't supposed to. If the structure falls apart, that guilt fades away, and you'd find yourself ignoring your obligations.