Once you've remembered the Spanish word for house or done a math problem correctly, continuing to practice does very little for long-term retention, says Rohrer. "Study a lot of material for a little bit of time in one session, rather than a little bit of material for a lot of time."
Declutter your life! Our March issue features a complete guide to streamlining your life, from Peter Walsh's 30-Day Organization Challenge to innovative ways to clear your mind. Plus, go behind the scenes of Oprah's yard sale and find out how you can improve the world with a simple "hello."