You have to concentrate and plan to memorize. Study repeatedly to boost your long term recall. Study to the point of overlearning. Actively practice the material you are trying to learn. Make the material meaningful .
Meaningful material is remembered much more easily than is meaningless material.
The more meaningful the material to you, the more relationships you can see, the more principles you understand, the more you will remember. Relate the material to what you already know. Put it into your own words and form as many associations as possible to increase retrieval. Use mnemonic, or memory devices for immediate recall of unfamiliar list items. Associate items with meaningful words or concepts.