Honestly, don't even worry about the Kaplan score. I'm sure you've seen by now that their tests are a whole lot harder than the real thing, and that their verbal questions are awful (I didn't use Kaplan, but I've read this soooooooo many times in all of the b-school forums I'm glad I didn't).
PR is much more accurate. If you can get your nerves in check (remember, the last few questions really only affect your score by 10-30 points), you won't make careless mistakes.
Also, don't go on from one test to another until you work through mistakes you've made on the previous one. In your case that might involve doing yoga

but I would especially work on reading RC on the computer. Totally agree that it makes boring passages even worse, but if you use PR's method of reading the answers and question first, then skimming the passage, it's not so painful because you don't read the whole thing.