I am so sorry to hear about your NCLEX. I was in the same situation a year ago. There are lots of support threads here at allnurses.com. Just type NCLEX in the search box at the top right hand corner and you will find many helpful fourms. You will get your instructions within a week on how to go by retaking the test from the BON when you get your snail mail result.
After I failed my NCLEX for the first time I was really devastated. I took a two week vacation to clear my mind and after I got back, I studied a minimum of eight hours a day for a whole month. I knew that I needed to strengthen my content area, so i studied from Saunders review book (I am not so impressed with their review questions which I think are a lot easier). I also practiced 100 questions daily from NCLEX review 3500 apart from the Saunders questions. I passed with 75 Questions. Kaplan review classes have more emphasis on learning strategies on answering questions but not on content. There are also very good online NCLEX type practice questions which you can subscribe for, https://www.ncsbn.org/nclex.htm
(national council for state boards of nursing) is one that I highly recommend and their fee is very reasonable. If you have more questions, feel free to ask. GOOD LUCK NOW