Hi WadeStan,
GMAC has publicly stated that the Official Score that you earn on Test Day is within +/- 30 points of actual ability. Your 4 of your 5 Official results show that you essentially performed the same each time (about 640+/- a few Scaled Score points). You handle certain aspects of the GMAT consistently well, but you also make certain consistent mistakes. Since you've been scoring at this level over the last several YEARS, it is likely that you developed some 'bad habits' during your earlier studies that are keeping you from scoring higher. Thankfully, the GMAT is a consistent, predictable Exam, so you CAN train to score at a higher level.
The scoring algorithm on the Official GMAT is far more complicated than most people realize. Since that algorithm is proprietary, no GMAT company has an exact match for it, thus CAT scores can vary a bit based on the 'biases' involved in their respective designs. 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). Thankfully, the CATs from Kaplan,
MGMAT and Veritas are all 'close enough' to the real thing that they will provide you with a relatively realistic score assessment (assuming that you correctly take the CAT in a realistic fashion that matches the parameters that you will face when you take the Official GMAT) - so you can use any NEW CATs from any of those sources next.
Before I can offer you the specific advice that you’re looking for, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) Over the last 3 months, what type of study routine did you follow? How many hours did you typically study each week?
2) What study materials have you used over the last year besides the course and books that you mentioned?
3) Before this recent attempt, on what dates (or approximate dates) did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
4) When are you planning to apply to Business School and what Schools are you planning to apply to?
While the ESR doesn’t provide a lot of information, there are usually a few data points that we can use to define what went wrong on Test Day (and what you should work on to score higher). Since you purchased the ESR, I will be happy to analyze it for you. Before you can include attachments with your posts/PMs, you need to have at least 5 posts in the forums (right now, you have just 4 posts). If you post just once more, then you should be able to include your ESR (and you can feel free to PM it to me directly if you would rather not post it publicly).
GMAT assassins aren't born, they're made,
Rich