yashi,
i echo what the previous guy said. one overarching impression of the gmat test was that the math is much harder than i would have thought. The verbal was actually much easier than GMAT prep, but who knows, it may have been just my particular test that day.
my last gmat prep score was q49, v 41 740. I spent the next 3 weeks almost exclusively on math. Why? Because I wanted to get 49 again or possibly even a 50 on the real thing. The verbal ability, particularly the ability of CR and RC is not something easy to improve in a short period of time, and not something I think you "lose" easily either. So basically the last 3 weeks I'd say 95% math, 5% SC. Not that doing verbal is useless, but if you are strong in math getting a 50 or 51 really catapults your score.
I HIGHLY suggest you find the GMAT PREP 1 and GMAT PREP 2 DS and PS problems (i got them on this forum) -- every single last one of them. Some guy hacked the software and outputted every problem and these are gold.. In fact, I also did all the problems for SC, and CR as well (SC and CR have like 200 questions total and won't take that long to complete). However, you're looking at 800 problems for GMAT PREP 1 and 2 DS and PS combined.
So anyway, since I only had 3 weeks, I was only able to complete the entire GMAT PREP 1 DS/PS problems. I didn't do a single GMAT PREP 2 problem aside from taking the test itself. I also was still going through OG/quantitative review problems i recorded that i either got wrong, thought were good problems, or were overall tough. all that emphasis on quant and my final score was
750 q49 v44
so as you can see, all that work on quant and i basically got the same score I got on the real thing so either i learned nothing those 3 weeks (not true) or the real quant is just that much harder (probably the case). moreover, my verbal score goes to 44 from 41 with very little preparation between my last prep test and the real thing.
if i had more time i would have done both GMAT prep 1 and GMAT prep 2 math questions. Yea it would take over a month, but you can finish all the OG stuff, manhattan stuff, etc. and then see stuff completely unrecognizable when you do the GMAT prep software.
if you aren't already, make sure you log every problem you get wrong OR you feel you want to try again. I just did it in a google spreadsheet. the list started with over 100 problems, and each pass through the list i'd remove problems i mastered. some problems i never mastered, but this process was how i learned.