Thank you all! I wanted to use the Manhattan GMAT (have only heard rave reviews about it!) but since I was short of time I realized there wouldn't be much use of it. Therefore, I relied more on practice. Worked on a-z of quanti samples from the OG 12th edition, and several number property problems online, as many as possible, including beatthegmat and other available online resources. I have to say that it helped me have a much better grasp on the number property problems. I developed much more confidence and understanding to tackle this area of quanti.
From my experience, I'd suggest that all GMAT aspirants should PRACTICE, PRACTICE, PRACTICE. Nothing else can give you a better advantage to conquer the GMAT. I was pressed for time to get as much practice as I wanted to, but all those who have planned ahead well as well as those who haven't should be able to get the best through consistent practice. ANd yes, I didn't take any prep classes, though, and have been successful on my own at the GMAT! Thanks to all of you who have helped me with your posts once again.
