1) What helped me is trying to really understand and comprehend the topic. This helped me memorize a lot easier.
2) You could also use flashcards, an app called Quizlet allows you to make flashcards and this helped me memorize things a lot too.
3) Another tip is to try to re-read information when you study. I usually try to re-read things when I am studying for an exam and I do this over and over again which has helped improve my comprehension in a topic.
Hope this helped (: