According to many studies, our attention span has dropped to about six seconds. Goldfish have better ability to concentrate these days then humans do. I know it sounds crazy but it has to do with so much multitasking that goes on these days and the constant exposure to advertisements. I used to forget most everything until I tried to learn to program. It was insane effort but eventually, I started to remember most things I learned. So check out codecademy and do a little programming it will help you find new ways to concentrate. Meditation is also great. If you achieve the ability to silence all the noise in your mind you will be able to think so clearly. I don't meditate half as much as I used to but I still try to do it for at least 30 minutes each day. It means the world to me to know you found this article engaging.