I relied heavily on the Leik book and her questions in the back, this was my favorite study source. I also studied out of the Fitzgerald book during my last two semesters of NP school and then purchased the fitz Q bank offline (5 tests). Completed 2 APEA, predictor exams (HATED these, they are difficult and make you freak out and doubt yourself). And then the day before my test, I did the PSI practice test and scored 82% and actually had 2-3 of those questions on my exam.