Hi pdas146,
The
MGMAT CATs are generally regarded as being a little tougher than the Official GMAT (so scoring a bit lower on those CATs isn't necessarily a bad thing). That having been said, while the most realistic CATs available are the 6 from GMAC, retaking a CAT that you've already taken is NOT a realistic way to assess your skills - since you will likely see some 'repeat' questions that you have already faced. Unfortunately, seeing even a couple of repeats can 'throw off' the Scoring Algorithm and impact your pacing, energy levels, fatigue, etc. (meaning that they would likely all appear to be better than they actually are). Thus, we also have to be a bit careful about assuming that the 700/740 are accurate assessments of your current ability level.
All things considered, you likely have the knowledge to hit a 700 right now, so we really have to nit-pick your performance on this 650. Back in August, when we were discussed your recent CATs at that time, you noted that you had gotten a lot of questions wrong because of little mistakes. What did you deduce about your performance on this recent CAT?
GMAT assassins aren't born, they're made,
Rich