Hi Uchiha15,
Many GMATers spend 3 months (or more) of consistent study time before they hit their 'peak' scores, so if you are going to limit your studies to just 15 days, then there will likely be a limit to how high you can score in that time.
Since it sounds like you're just beginning your studies, then it would be a good idea to take a FULL-LENGTH practice CAT/mock; 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 practice 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 discuss the results and how you might best proceed with your studies.
I'd like to know a bit more about your timeline and goals:
1) What is your goal score?
2) What are the exact application deadlines for each of the Schools that you plan to apply to? Would you consider applying for Round 3?
GMAT assassins aren't born, they're made,
Rich