Hi assaffff,
GMAC has publicly stated that a Test Taker's Official Score is within +- 30 points of actual ability. Assuming a similar 'swing' in how these CATs function, 5 of your Kaplan CATs fall within 30 points of one another - this means that you essentially performed the same way on these CATs. The GMAC CAT that you took had a lower Verbal score, so we should examine how you took each your CATs (for comparison purposes):
When you took your CATs:
1) Did you take the ENTIRE CAT each time (including the Essay and IR sections)?
2) Did you take them at home?
3) Did you take them at the same time of day?
4) Did you ever do ANYTHING during your CATs that you couldn't do on Test Day (pause the CAT, skip sections, take longer breaks, etc.)?
5) Did you ever take a CAT more than once?
GMAT assassins aren't born, they're made,
Rich