Hi Khaled951,
Since it sounds like you're just beginning your studies, then it would be a good idea to take a FULL-LENGTH practice CAT Test; you can take 2 for free at
www.mba.com (and they come with some additional practice materials). If you want to do a little studying first, so that you can familiarize yourself with the basic content and question types, then that's okay - but you shouldn't wait too long to take that initial CAT. That score will give us a good sense of your natural strengths and weaknesses and will help provide a basis for comparison as you continue to study. A FULL CAT takes about 3.5 hours to complete, so make sure that you've set aside enough time to take it in one sitting. Once you have those scores, you should report back here and we can come up with a study plan.
As an aside, many Test Takers spend 3 months (or more) of consistent study time before they hit their 'peak' scores, so if you limit your studies to just 2 months, then there might be a limit to how much you can improve (and how high you will Score on the Official GMAT).
I'd like to know a bit more about your timeline and goals:
1) A score range of 600 - 700 is rather broad, so you might want to do a bit more research into the Programs that you are interested in - so that you can better define the type of GMAT Score that would help make you a strong Applicant (for example, what data do you have on your first-choice School? Is it possible that that School would expect a Score that's significantly higher than a 600?). By extension, what is YOUR goal score?
2) When are you planning to apply to Business School? If the application deadlines are coming up soon, then what are the exact application deadlines?
GMAT assassins aren't born, they're made,
Rich