HI Swetha,
It's important, early on in your studies, to establish a 'baseline' score. We can use this to get a sense of your immediate strengths and weaknesses and it will serve as a basis for comparison as you continue to study. As such, you should plan to take a FULL CAT soon (you can download 2 for free from
www.mba.com). A FULL CAT takes about 4 hours to complete, so you should make sure to set aside enough time to take it in one sitting.
If you want to get in a bit of practice to familiarize yourself with the material that will be tested, then that's fine, but you shouldn't wait too long to take that CAT. Once you have that set of score results, you should post back here and we can talk about the various ways that you can approach your studies.
GMAT assassins aren't born, they're made,
Rich