Hi Nidhijain94,
To start, many GMATers spend 3 months (or more) of consistent study time before they hit their 'peak' scores and during that time, studying for 15 - 20 hours a week is common (with smaller study sessions throughout the week - and not just on the weekends).
If you took just that one CAT/mock, then it's not clear what your actual 'ability level' is right now (re: you might have gotten a bit lucky or unlucky on that CAT - so your actual level might be closer to the low-500s or low-600s). As such, you should plan to take a NEW CAT/mock sometime soon - and make sure to take it in a realistic fashion that matches-up with what you will face when you take the Official GMAT (take the FULL CAT - with the Essay and IR sections, at the same time of day as when you'll take the Official GMAT, if you will be at a Test Facility, then wear a face mask, etc.). Once you have that Score, you should post back here (or you can feel free to PM me directly) and we can discuss the results and how you might best proceed with your studies.
1) Are you planning to take the At-home GMAT or are you planning to take your GMAT at a Test Facility?
2) Going forward, how many hours do you think you can consistently study each week?
3) What specific application deadlines are you considering (are you planning for Round 3 or next cycle's Round 1)?
GMAT assassins aren't born, they're made,
Rich