Hey Kaplan Reps, what is up with the practice tests?

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GMAT Score:720
I am enrolled in the in-class prep course. I have taken the GMAT and wanted to improve my score, so I enrolled. I took my third practice GMAT today, and the score was completely off the wall. Here is my score history including my real GMAT.

Gmat 680 (86%) 44V (97%) 39Q (55%)
Diagnostic 690 (92%) 43V (97%) 41Q (67%)
CAT 1 660 (83%) 48V (9%) 38Q (53%)
CAT 2 640 (76%) 44V (97%) 38Q (53%)
CAT 3 700 (90%) 34V (69%) 52Q (99%)

How the heck did the Quat score get up into the stratosphere? How are these tests even scaled? I haven't even heard of a 52, and believe me, there was no way I was answering 99th percentile quant questions in test 3. What is going on with the scoring? Or is it a matter of the question pools. I was noticing that the quant questions were very similar to questions that were just reviewed in the last class. Are the tests built with indiviual question pools that replicate information that has just been taught? WTF? (and I mean that in the nicest way possible - I am utterly confused!)