Cover it and try to hear it in your mind. Check back and then recite it aloud. Read your notes or a friend's notes into a tape recorder and play the tapes back to yourself. Explain orally to a friend the material you are studying. Use oral memory tricks where possible.
Some people are primarily kinesthetic learners who learn best by doing, touching or moving.
Write down important points as you read. Cover the materials. Write the facts from memory. Use manipulatives wherever possible. Volunteer to actually handle materials in Math, Science, Practical Arts, etc.