When you associate, you make the things you want to remember relate to each other in some way. Visualization helps you to create a strong, vivid memory. Try to picture in your mind what you wish to remember. People often say that they can't concentrate or that they will never be able to learn to concentrate better. Quite often it is our way of life that takes away our former ability in this area.
Small children are well-skilled in concentration.
Concentration can be defined as focusing attention on one thing and to one thing only. Visualizing will help. Visualizing forces attention to one thing only. If you try to see specific pictures as you read, it will help you to concentrate. Not looking back will also help you to concentrate.