1) I took the AANP Adult Certification Boards- I was on the fence on which certifying body to take my boards from. The AANP is a little cheaper on the exam fee..and they only certify Adult and Family. AANC is a bigger certifying body that certifies Adult, Family, Acute ,Gero, etc..
I like how the AANP represents only NPs ...I suggest looking at the respective websites for more information.
2) I'm a new NP...so I just took the boards earlier this summer. Everybody seems to like Fitzgerald's exam review. I bought the review book and the review CDs which helped immensely.
I also bought another review book by Joann Zerwekh, this book had difficult questions but it really made me study and I passed the exam no problem. It's impossible to know everything, but for me having two different review books helped me prepare. I would do a search on NP review books on amazon
.com and also do a dissucssion search on allnureses on AANC and AANP exams.