How reliable is the GMAT® exam? Do scores vary a lot from test to retest?
The standard error of measurement of the GMAT® Total score is 29 points—meaning that the test taker’s true GMAT® Total score is within 29 points (above or below) of the score he or she received on the test. Thus, test takers with GMAT® Total scores of 580 and 600 may not be materially different in terms of their performance on the GMAT® exam. This is why GMAC® does not recommend the use of hard cutoff scores. The average reliability for the GMAT® Total score is 0.92 (1.00 is the highest possible reliability coefficient).
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