I think concentrating is somehow very hard for everyone, especially for young adults, teenagers, and kids. I sort of think it's impossible to 100% concentrating something. There are so much things inside the brain, like memories, knowledge, etc. I believe if one's doing on one work, and there must be sometimes that he isn't focusing on and think something else. For me, I am one of those people who is having problem just to concentrate on one work. I have always wanted to finish my school work earlier but my mind keeps telling myself to have a little bit of fun, than time for my work. As a result, time passes by, and I am doing things on last minute. There are people who are really good at concentrating on things, but the population of them are small. I think concentrate is one thing with born or trained since like a kid.
Right now, there are so many technology things that could easily distract us, like i pods, computer, T.V, etc. Too many thing fun things around us. If a person could stay on one thing and want to finish it around these technology things, that person gets good concentrating skill. Just like me, I couldn't do any of my homework in front of my computer because I will keep using messenger to talk to people and it really makes my speed of doing homework lower. And I still remember once, I was about to mess up because I really need to finish those homework in a short time, and I knew computer and i pod will distract me. There fore, i decided to turn them off just to make me stay focus.
I think it's really hard to practice on concentrating, well I think it's possible for training concentration, but putting effort for long time will be needed. I more likely think I am "making" myself to do homework because of no more time, and not "practicing" to concentrate to do my homework.