You should "complete" one of your outstanding areas - either verbal or math. Be done with it and then focus on the other.
I would also recommend to immediately take a diagnostic test, such as GMATPrep or other and see where you stand - you may need Sc: more/less work than you think. DO IT!
If you need help with CR, get the PowerScore CR
book - it has been recommended by many on this forum.
It is fantastic that you are doing great with RC. This is usually the hardest area to improve.
Put more emphasis on learning/reviewing basics in math than crunching questions in the OG - much more effective. You can try Kaplan Math Workbook
if you have access to it or if you need a lot of help, you can try Kaplan
However, I think we need to see you GMATPrep performance before we can really give a quality recommendation.
Thanks for the reply.
In fact, I gave a diagnostic and scored 510 with the following break up:
Quant (Scored-35, 23 Correct)
Verbal (Scored-25, 23 correct, only 38 attempted)
I reviewed the quant section and found the areas where I'm lacking competence - Coordinate Geometry, Probability and Combitronics (P&C) and DS type questions of Applied Maths.
I've already completed PS questions of OG and currently mid way in DS.
I'm yet to study the P&C topic but will try to complete it in this week. I've reviewed Coordinate geometry once and now confident about it.
The problem I'm facing the most is in DS type Applied problems in which I tend to spend more than usual on coming to an conclusion required for answering the questions. I did try to learn and improve the nitty-gritty of such questions by studying Kaplan Math workbook
and Kaplan Premier
CD, it really helped but the speed required to answer the question is missing.
SC: I got most of SC questions correct.
CR:Though I tried my best to understand the stem and question but still couldn't get the correct answer.
As suggested by you, I did try to study CR basics but I am just unable to apply the funda in most of the questions. Every time, it boiled down to using spontaneity and basic understanding of the passage.
The biggest problem I'm facing is in the Economy related questions of CR & RC. I'm from an Engineering background and do not understand the Economic terms, Marketing Strategies, Insurance policies type of questions. Even after spending a lot of time on figuring the correct answer, I mark wrong answer on these type of questions.
RC: During the GMATprep test, I found a RC passage (Out of 4) which dealt entirely with Economy and even after repetitive attempts I could not understand the passage. Hence, I got all the wrong answers.
Please suggest a way to improve now. I've rescheduled my GMAT appointment for September 29th.