Ok I was in the same boat last year. Stay positive don't throw in the towel yet. I didn't buy all that online stuff I had books: Saunders, Kaplan Strategies, Exam Cram, and PDA (this book was good but more RN to but it made you think), and let me not forget Youtube. Oh the 35-page study guide that's going around on this site. But you have to find what works for YOU.
How focus are you when studying? Are you taking notes, making notes cards, what's your weak area(s), are you understanding the content, or are you understanding what the question is asking (be careful with this), theses are some things to ask yourself.
You really don't want to over do it with a lot of studying materials then you start to get overwhelmed. Once again find out what works for you but Saunders and doing questions 50 to 100 a day (testing myself with the bubble answer sheet) yeah I know I test myself as if I were in school:yes: , note cards, taking notes is what I did.
The first thing you must get out of that negative thinking because there are so many successful stories on this site from people who has taken the NCLEX multiple times. Second get back motivated looking at your babies is motivation. Third show those babies that their mother is a fighter and don't give up easily and about to change her life and there's by becoming a NURSE. If this is something you're passionate about fight for it.