Hi Anamika,
If you want to begin your MBA Program in September, 2022, then you have given yourself plenty of time to study for the GMAT and work on your applications - which is great! Since you're not in an immediate rush, you might consider spending a little time researching Programs that match your Career Goals. In that way, you'll be able to put together a list of Schools that offer a Degree that interests you - and you can get a better sense of what you might need to improve your Overall profile as well as the type of GMAT Score that you might need to be considered a competitive Applicant at those Schools.
Once you are ready to begin your studies, 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 once you begin, 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 that Score, you should report back here (or you can feel free to PM me directly) and we can discuss the results and come up with a study plan.
GMAT assassins aren't born, they're made,
Rich