If I am completely and utterly alone that is when I have the best concentration. If I am around people,even people I am extremely fond of. I won't achieve maximum concentration.
My Way Of Achieving MAXIMUM Concentration.
1.Get Depressed.
2.Watch An Episode Of Your Favorite Series Or A Movie.
3.Think How Small You Are Compared To The Universe.
4.Lie Down.
5.Listen To Some Music.
If you have a DS/3DS, Brain Age concentration games are pretty cool. I love them. That was the first thing that comes to mind. Reading also really helps increase my brain activity.