Don't be nervous its not as bad as you think. Before I took my test I used the ATI study guide, I feel like that helped me tremendously. I bought my book in summer of 2012 for the test I was taking in February 2013. I just looked through it to get a general idea and look at what I should focus on in my classes also. I didnt study the book hard or do any of the practice test until about a month before my test. I spent maybe 10hrs week in the first two weeks and then 2 weeks before the test I hit the books really hard and studied the book over and online resources multiple hours a day just to be sure I felt like I was ready. Hope this helped!