Kaplan, Manhattan GMAT Test Scores

All,

I am having my GMAT Test on 11th September 2013. Meanwhile, I am preparing for the exam since 3 months approx now (Started mid June). I have taken 3 Kaplan tests and 3 Manhattan tests in this duration. Apart from this I gave GMAT Prep1 and a sample test from Veritas. The scores I am getting is as below:

Kaplan Tests:

CAT1 : 720 (Quants 68%, Verbal 50%)
CAT2 : 710 (Quants 72%, Verbal 63%)
CAT3 : 750 (Quants 89%, Verbal 50%)

Manhattan GMAT Tests:

CAT1 : 700 (Q47, V38)
CAT2 : 720 (Q51, V37)
CAT3 : 730 (Q45, V45)

Veritas Sample Test:

680 (Q48, V36)

GMAT Prep Test1 (The first test I gave during my Prep):

680 (Q48, V36)

Apart from these tests, I will be giving a few before my final Exam. I am not very sure whose rating is correct. I gave my Kaplan CAT 3 today. Got only 4 wrongs in quants and 21 wrong in Verbal and still managed a 750. I am not sure about the marking here. Please help. Also, suggest what else I should take care of as the D-Day is just a few days ahead

Thanks,
Vinayak