NCLEX definitive body of knowledge

[frodo-dog]

I apologize if this has been answered before, I couldn't find it though.

Previously, when I worked as a project manager, you could get PMI certified. You read the PMBOK (Project Manager Body of Knowledge), took the test and then could get certified.

Now I am in the nursing program, I have many different books, Saunders, Mosby, and Prentice Hall to name but a few. I find the information in them to be different and often contradictory. Like whether to rotate insulin sites, some say "yes, must do daily", others say "not needed" or "weekly only". I just got a "passing" score on my block 2 HESI, when I looked up the info in my books, I was correctly quoting from them, but apparently not what HESI believed.

Is there not a definitive body of knowledge? I believe that NCSBN writes the NCLEX, don't they have a book of information that is their expected answers?