Answer:
It was proven by the Psychologist, Hermman Ebbinghaus, that conscious repetition or rehearsal, helps the brain encode information. Although, he discovered that the amount of information you will remember depends strictly on how long you study. Also, even after repetition, "overlearning" (more reviewing) increases our ability to remember the information.
Basically, the theory of "practice makes perfect" is true. Studying longer and practicing will definitely help you learn and memorize. :)