I also did the Kaplan Live Review, and was told by my instructor (on the down low) that if I was getting 50% or higher on the QBank and Trainer tests, I was doing just fine. I averaged between 60-70% per test and passed in 75 questions. I have a friend who was averaging in the low 50's and passed in 85. If you have been diligently studying, you have nothing to worry about.
My best advice is to take your time and think through each question, but once you have an answer, stick with it! Do not second guess. Most importantly, be confident in yourself and your abilities. You got through nursing school and landed a job. You are highly capable of passing this test! Walk in there telling yourself, "I got this" and you have won half the battle already.
Best of luck, dear! I know you will do just fine. :)