Figured id just give a little advice for what I found to be the most useful study resource.
The first time I failed the NCLEX-RN VERY fast (like 90 something questions). And had a friend that also failed.
We both used the Yellow Saunders book
Saunders Comprehensive Review for the NCLEX-RNŽ Examination, 5th Edition
And found it to be by FAR the single best resource. Its the closest thing to covering ALL of nursing school again all in one book. Read this book (1200~) pages cover to cover, and it will teach and refresh you everything from nursing school.
Plus it has questions at the end of each chapter (which are incredibly basic/easy and straight forward from the book) with EXCELLENT rationales for all of them.
Id say as far as core content (Which is imo the single most important part of the test) this is flat out the BEST resource.
As far as questions its not really that helpful because the questions are INCREDIBLY easy and right out of the chapter (but the rationales are excellent), I found the pharmacology in the book to just be difficult to follow and didnt really add much.
Either both me and my friend BOTH failed the first time, and used the yellow Saunders book and both passed (well my friend definitely passed, i got the good popup but am still waiting)
I HIGHLY recommend that the yellow Saunders book be the basis for any study program then just combine it with whatever questions you have access to or find recommended. Good luck !