Improved 100 points, how do I improve another 100 points ...

[mharv]

In the past 4 months, I have used every resource possible (PrincetonReview, OG, test coaching center material, MGMAT, Quizmoz)

My overall score in July was 430. In December I am a 550 as per GMAT Prep and MGMAT, is it possible to go the next level to improve another 100 points to 650 and what are the steps needed to get there

I am good to PS, CR. RC average, poor at SC and DS - I am getting more right than wrong which again is better than 4 months back

[Has]

It maybe worth signing up for classes, i know MGMAT (good for SC and DS) has offers for the holiday season.... whoever you go with, if you do, I think it will help, as sometimes it is just fundamental content and strategy that one needs to brush up on.