Make sure you engage your brains with effective studying! I have found a scientific study that should emphasize my point.
As you can see World of Warcraft can drastically reduce student performance. (Note that WoW can be replaced by any other non-academic pursuit.)
Ways to study that are better than reading:
- Writing and condensing notes
- Creating explanations in your own words
- Creating sample questions that you think could be on the test
- Sharing those questions with others (This is studying with a partner, as opposed to reading and then playing GTA on breaks.)