It helps to say things out loud. It will stick in your memory better. Use mnemonics (like "every good boy does fine" for the notes EGBDF when reading music). Also, Brainscape.com is a free flash card and studying site that I recommend.
Look up your facts, write them down, try making them into something you can remember. Wether it's an object or a simple word you can remember. Then test your memory by quizzing yourself or list the things you can remember.