I am having the exact opposite experience regarding quant with Princeton Review vs.
MGMAT.
Princeton Review CAT 1 - 530 (33Q, 30V) no prep
Princeton Review CAT 1 (Retake after initial prep) - 650 (39Q, 41V)
Princeton Review CAT 2 - 660 (39Q, 43V)
MGMAT CAT 1 - 730(!) (46Q, 44V)
I got a significant number of incorrect questions on the
MGMAT quant portion - mostly because they were, in fact, harder than the Princeton Review math. They did indeed seem very reflective of the stuff you learn in the
MGMAT guides. However, I still can't wrap my mind around the fact that I answered 16 out of 37 incorrectly and still managed a 46Q.
Obviously there is a difference in the algorithim. In my Princeton Review course, my instructor seems obsessed with the idea that the first 10 questions really determine your overall score. Maybe this is reflected in the Princeton Review CAT? Because in
MGMAT, I answered questions 2, 3, 6, 7, and 8 incorrectly. And I still ended up with a 46Q. Princeton Review I got 9 out of the first 10 correct and ended with a 39. And I did not get 16 incorrect answers, I know that much.