Dont take my word for it but I personally think that Kaplan scores mean Horse Shi##
I took Kaplan and saw about a 100 pointe deduction from my Power Prep and Princeton Review scores. I missed 13 in one of my math sections on kaplan when i missed 3 in Power Prep. I understand if I had missed just a few more but such a big difference leads me to believe that Kaplan is a lot harder than the real thing. Furthermore, I have noticed that a lot of people feel the same way about Kaplan as I do.
My suggestion: Take a PP, thats the only test I see almost 95% agreeing on as being a good indicator of your abilities.