Kaplan's classroom CATs are definitely not "harder" than actual GMAT tests. In fact, they are continually assessed and updated to ensure validity and accuracy, which means that practice test scores from classroom CATs are a very good indicator of your actual GMAT score level. Also, the correlations between highest Kaplan CAT score and the actual GMAT score are extremely strong.
The CATs on our retail CD have a different scoring algorithm than the classroom CATs, but not because the tests are "harder." Back when the GMAT went from a paper-based test to a computer-adaptive test (CAT), the Kaplan folks who created the CD CATs chose to err on the safe side, and set the curve for the scores lower to avoid having students going in on Test Day and receiving an unexpectedly low score. Therefore, it is well-known to business school applicants that those using Kaplan CD should expect to go up 70 - 100 points from their CD scores on Test Day. You could possibly read as much on this blog and other GMAT blogs.
That being said, I am as stumped as my colleague about the tests with the order of the questions as you describe. But since you have the 2009 edition, I would recommend taking one of the 4 other additional CATs that came with your companion. Those CATs are aligned with our classroom course CATs, and will give you the best indication of where you currently stand with your prep and target score.
I hope this has been helpful, and I wish you the best of luck on your exam!
Sincerely,
Monica P. Lugo
Editor - Kaplan Publishing
--
We build futures one success story at a time. Visit us at
www.kaplanpublishing.com