Learn where you can find key Bible passages. Do this by yourself, in a group or with someone you are mentoring (or someone mentoring you).
Search for anything you like: a person, a book, a topic... and/or choose the category that you want to memorise (Old Testament, parables, etc.).
Select a card (in your mind).
State where you think you would find that passage..
Click on the card to see where it is found. How did you get on?
Leave the cards "flipped" so that you can see the references. Come back to them later and try to identify what passage it refers to. Flip the card again to see how well you did.