It is well before most grad school deadlines (traditional MBA programs excepted) but there is lots you can do to get started.
If you haven’t already taken the standardized test (GRE, GMAT), it is time to prep now. Start with free sample tests taken without any prep so you can establish a baseline score and determine how much more to go. Then start using some of the available test guide books (but only the ones that come with computerized sample tests) to study and monitor your improvement via the sample test results. They are widely available at bookstores and through Amazon.com – here are just a few of the many available options. There are even some editions just for the Kindle these days.
- Cracking the GRE with DVD, 2011 Edition (Graduate School Test Preparation)
- Barron’s GRE
- McGraw-Hill’s GRE, 2010 Edition
- The Official Guide for GMAT Review, 12th Edition
- Kaplan GMAT 2011 Premier with CD-ROM
If the sample test scores are not improving quickly enough or to the level you hope for, then consider turing to a test prep organization. There are many such companies including, Kaplan, Princeton Review, and Veritas, just to name a few. Continue adjusting the amount of effort and investment in test prep efforts based on your progress toward the test goal you set for yourself (plus a cushion because your actual score will suffer on test day due to nerves and jitters).