I just took it a few months back so maybe I can be of help. =) Out of curiosity, what school are you planning on applying to?
The Kaplan Entrance Exam has 4 portions: Reading, Writing, Math, and Science.
For the reading portion, I had long passages to read and then answer multiple choice questions. It's very similar to the reading you'd have on the ACT or SAT except easier! You can prepare by doing some sample passages and questions, but don't stress it.
I should have done much better than I did on the writing portion. It has passages that are usually 2-3 paragraphs long. They ask questions about the passages like, "Which sentence is not needed?" "In which sentence to the verb and subject not agree?" "Which sentences could be combined?" If you use the kaplan study book (which I did), do not bother with the writing portion of the book. It is not similar at all to the test. I mean it, I completely did not expect the writing portion to be like it was.
The math was very basic. The majority of it was conversions from decimals to fractions and fractions to decimals. There were a few very simple dosage questions so you may want to do a few samples of those. The problems were pretty easy and I got a 95% in this section.
The science is like everyone else says, all A&P. My test seemed to be primarily A&P II. I had only had a month of A&P II when I took the exam and I did okay, but not stellar. Because I was worried about that section, I had bought an Anatomy and Phys. For Dummies book to try to review with and learn the stuff I hadn't learned yet. It was helpful and I recommend it.
Good luck! Let me know if you have any questions!