I usually isolate myself as I am very easily distracted and allow myself extra time in case I get distracted.
If the material you are studying for have a particular series of answers (history, etc.), read more about the subject on Wikipedia. Chances are you'll remember it better if you know a more complete story, and if you forget specifics, you have a better chance with BS.
If it some that has variables associated with it (math, etc.), the best help is to do as many practice problems as possible. Make sure you are coming up with right answers by solving the same problems through google.
And I don't recommend this, but due to my procrastination habbits I find myself working till 4-5am, motivated on the promise of sleep. Try not to justify anything at this time other than doing your work.