Here's a study experiment to try.

Next week, promise yourself that you'll spend one hour a day studying or doing homework with absolutely no interruptions, totally and completely focused on your work.  When you do it, set a timer to go off in one hour.  Then turn your phone off, turn your computer off, close the door and don't pick your head up from the work for an hour.  Then reward yourselves with some email, text, music and Facebook time for 10-15 minutes.

When you turn everything else off and turn your focus on, I'll bet you spend less time studying, you'll be done with your homework earlier, and you'll remember more of what you learned.  Wouldn't it be worth it?