Go to a bookstore and look through the various NCLEX RN books. Find one that best fit your method of learning.
I spent sooooo much money on multiple books----Saunders, Exam Cram, Hurst, NCLEX Made Easy, etc, etc and a whole lot more. It wasn't until I found MaryAnn Hogan and this was the book that got me focused and disciplined on studying for the NCLEX RN.
Don't give up. I graduated 19 years ago (never worked in the nursing or medical field) and took the NCLEX RN in 2011 and failed. Then took it again Dec 2012 (studied for a solid 4 1/2 months) and passed with 88 questions.
YOU CAN DO IT! Good luck!