Hi lorijorn, I have several books, and they were all helpful in one way or another. But what I think really really helped was a two day prep class for Inpt OB. I can't imagine how I would've passed without the class. I traveled from Illinois to California to take the class and sit for the test at the same time, it was well worth my money. I will provide the link! Good Luck to you. Professional Education Center - 2012 Inpatient OB (NCC RNC Exam Option Onsite)