I scored following in kaplan:
#1. 720 (Q54, V40): I think the score in verbal was a fluke, because i could never score that high in verbal again.

. So i ignored this score.
#2. 600 (Q52,V23) : At first i was quite shocked at my verbal score, but i think Kaplan verbal is very difficult, with very close answer choices in CR and RC. Which might not be a correct representation of the actual gmat.
So, i think we all are in the same boat, with regard to Kaplan verbal. Will give some shot at PR and Power Prep tests, as suggested by you people. I felt Kaplan 800Score tests to be relatively easier, as i did fairly well in those, (Q-55,V43) and hope that the difficulty level is that of gmat... touchwood..!!! Becoming a bit selfish....
I found kaplan verbal workbook and this gmat discussion forum very useful in improving on my SC.