by mdinerstein Fri Sep 07, 2007 3:55 pm
While we take pride in the fact that our practice tests are continually re-calibrated and updated every three weeks to reflect the current state of the GMAT, we also advise our students not to take their scores on their practice tests as absolute indicators of their performance on the real exam. This is due to a wide variety of reasons that range from anxiety on test day to the inherent 30-point standard deviation on the GMAT Exam (which means that if your "true" score is a 670, you could score anywhere between a 640 and a 700 and statistically be at the same level).
Generally, for this reason, we encourage our students to use a standard deviation between 40 and 50 when analyzing their score on our practice exams. Hence, if you're scoring in the high 600s, you'll most likely wind up around that number, but there's a chance you could dip as low as a mid-600s or a low-700s.
What's really valuable about our practice CATs are the Assessment Reports. These reports can really help you understand your performance not only on particular questions, but on general trends between sections and question types.