I would go ahead and take the Kaplan Course. I say this because it really does help, especially with the strategies for the exam. And I am a HIGHLY anxious person to begin with, so I really believe that that had a lot to do with me not passing. I was thinking about it today, and while I took the course I wasn't concentrating on the strategies but, instead, I was thinking about the actual test. I preoccupied myself by worrying about failing or passing rather than focusing on HOW to take the exam. The mind can certainly be my own worst enemy because I'm always doubtful. But don't be like me, lol!
I wish you ALL the luck in the world with Kaplan AND the N-CLEX!! Don't ever give up!