I recently passed the NCLEX and I can tell you from personal experience that the questions from Kaplan are a little harder than what is actually on the test. Definitely use the strategies for how to answer the questions. I think you should move to a different review book and a different bank of questions. The test will be mostly SATA and priority. I found this website had questions most like the NCLEX: http://nursing.slcc.edu/nclexrn3500/mainMenu.do
I know I push this site a lot but this is available to everyone courtesy of the school I attended and its what my class of 120 students used to prepare. None of us did a review class.
It sounds like you know content so I think you need to prepare yourself for the questions. I did two 75 question tests every day before the NCLEX. I used a HESI comprehensive review book to look at areas I was weak in. I did not read the book in its entirety, I found answering a ton of questions and reviewing the rationales is what helped me.
I did attend a free online Kaplan class: it was 15 minutes of strategy and 40 minutes of reasons why you should buy their review program. These are the tips they shared:
1. When lab values are presented they will be very high or very low so if you know the basics you can figure it out.
2. You are expected to get half the questions wrong.
3. If you can get the first 6 right it keeps you way above the line (in practice I always went back to see how long my correct answer streaks were)
4. 15 questions will not be scored, they are testing them for future exams.
When I did practice sessions I used ninja focus on the first ten questions, taking my time looking at the answer choices. After awhile this speeds up and you start to feel more confidence.
Priority questions are tough. I have seen a lot of people on this site use La Charity to prepare for them. That might be worth looking into. I did not study meds at all. I ended up with 2 med questions on the test and both were drugs I had never heard of so I used Kaplan strategies to guess my way through.
It's my opinion that you should keep it simple. They are testing for minimum proficiency, they want a safe entry-level nurse on the floor. Don't over-think the questions.
Good luck! Keep in mind most of us do not feel prepared enough when we go in. Stay calm and remind yourself that you know this stuff.