I used http://www.RnQuiz.com and found it useful. After failing 2 times I was really desperate and finally passed. They had tons of material to review. I also never used Kaplan, but read some bad reviews about them. I found it easier to study off of my computer then reading from a book. Plus with RnQuiz they grade you online so you don't need to keep going to the back of the book to see if you got the answers right or wrong.