Hi mill99,
There are two resources that almost all Test Takers use (and they come from the Official Test Maker):
1) The GMAC
Official Guide 13th Edition (or the GMAT2015 - they're the same book).
2) The 2 free practice CAT tests and practice problems that can be downloaded from
www.mba.com Most Test Takers spend 3 months (or more) on their studies to hit their "peak" scores. During that time, it's common to spend 10-15 hours per week (or more) on your studies, but that does NOT mean that you have to study every day. You'll probably need more than just the resources that I mentioned, but we'll have a better idea of your strengths and weaknesses once you take a FULL-LENGTH practice CAT (a CAT takes about 4 hours to complete, so make sure that you've set aside enough time before you take it).
There are plenty of GMAT Courses to choose from. Most GMAT companies offer free resources (practice questions, Trial Accounts, free videos, etc.) that you can use to "test out" a product before you buy it. We offer a free Trial Account at our website, so you should try it out. You should take advantage of all of these options, then choose the one that best matches your personality, timeline and budget. If it's a Course, then it should include a study plan and timeline for you to build your schedule around.
When are you planning to take the GMAT?
What is your goal score?
When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich