The NY Times posted an article that may change the way you think about studying. Although we should read the actual reports produced by the researchers, the article suggests students are more likely to remember information if they study it in two different locations rather than the same location twice. For example, you may study for your midterm in the library, and then on another occasion, study for your midterm in your room as opposed to studying twice in the library only. The varied location allows for more scaffolding due to the changed environment (regardless of whether the scaffolding is conscious or not).
Interestingly on the second page of the article, the author mentions why practice tests and quizzes are a powerful of learning, not just assessment!
Check out the article: http://www.nytimes.com/2010/09/07/health/views/07mind.html