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The two tests are built a little bit differently, but both are built on the same underlying CAT theory - there is variation in the number of questions wrong (for example, we don't include experimental questions on our tests), but the overall results are still valid / applicable.
I'd like to dive a bit deeper into what may have happened on your first real test, though. You say you froze - do you mean that your nerves got to you? What else happened - did you have any timing problems? Any stamina issues? (The more detail you can give about these topics, the better - though don't give any details about actual test questions!)
Had you been taking your practice tests under 100% official conditions, including essays and length of breaks? If not, how did you deviate from official conditions on your practice tests?
_________________ Stacey Koprince Instructor Director of Online Community ManhattanGMAT
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