by JonathanSchneider Wed Mar 04, 2009 1:50 am
We do try to make our CATs as accurate as possible. However, we do not use the actual scoring algorithm (it's never been published). In general, we find that our CATs have a standard deviation of 50 points, whereas the actual GMAT has a standard deviation of 30 points.
You may consider taking the two downloadable tests at mba.com. These are better overall predictors, as they use the actual scoring algorithm.