Don't worry about your Kaplan
scores...it's been written many times in the forums that their tests are good practice, but that the scores they give tend to be about 50-100 points below what you would get on the real thing.
Take some more practice tests - PR and Powerprep are a lot closer to the real thing. I would suggest Verbal Workout from PR to ace the verbal section, and possibly their Grammar Smart book (excellent grammar bible to have on hand for the essays, btw - all the English grammar rules. I am keeping this one after it's all said and done!).
And definitely plow through the OG. It's your best bet for practice questions.