Hi there,
Rest assured that the online CATs used in our courses are continually assessed and updated to ensure validity and accuracy, which means that practice test scores are a good indicator of your actual score level. Kaplan has the most experience preparing students for the GMAT, prepares more people each year for the exam than anyone else, and a recent Harris poll showed that more people actually get into business school with a Kaplan GMAT course than any other course...so do not despair or over-worry about your preparation choice!
You may hear comments that the "Kaplan CATs score too low", which is referring to the fact that our retail/publishing division has included until this year, a CDROM version of our CATs, which is NOT updated continually in the manner that our online CATs are (and all students who take an actual course with us receive access to our 9 online/updated CATs). The publishing division has, this year, allowed online access as well to book-buyers, so I always recommend if you are just prepping with a book, do the CATs online, not on a CD. They'll be removing the CD with the next potential opportunity. As long as you are taking online CATs, you are using the most current and realistic CATs.
Anyway, the most important thing to remember is that no one practice test score should be taken as indicative of exactly what you'll score on test day, and if you are not finished with your studies yet especially, you should still plan on improvement to your scoring. Focus on your actual breakdown and strengths and weaknesses, and learn from each practice CAT that you take...use them as study tools; that is one of the best ways to improve.
Good luck and let us know if you have other questions!
Jen Kedrowski
Kaplan Test Prep & Admissions
GMAT Teacher
MBA Admissions Consultant
National Product Team Member