I checked out this forum before when trying to gauge how accurate of a predictor Manhattan GMAT scores are when compared to the real thing - so i thought i'd contribute. I take the actual exam on Wednesday, and plan to take the 2nd GMAT from GMATprep tomorrow.
here are my scores:
MGMAT 1 - 680 - Q44, V38
MGMAT 2 - 740 Q47, V44
MGMAT 3 - 690 Q43, V40
MGMAT 4 - 680 Q46, V36
MGMAT 5 - 730 Q45, V45
MGMAT 6 - 740 Q47, V45
GMAT Prep1 - 750 Q49, V44
GMAT Prep2 - 720 Q44, V44
We'll see how the real thing goes, but all I want is a score around 700. Hopefully the MGAMT's and the GMAT prep are accurate indicators of what's to come.