Difficulty level of questions on OG verbal review vs Kaplan?

[mdaprasad]

I am in a strange situation evaluating my performance, I hit around 70 to 85% on SC, CR and RC when
I do OG verbal review, but when I do practice questions on Kaplan or PR 2009, my success rate is around 60-65%.

Any one feels the same way about these questions? I know the best way to get an idea is to give GMAT Prep Test, but I am preserving those precious tests.

Note: Timing was not an issue in both the scenarios.

Regards

[mousymouse]

i believe that most people state that the Kaplan ones are generally a bit harder or harsher scored.

[skang357]

it is known fact that Kaplan averages 100 pts lower.