It took me 3 times before I finally passed. It happens. The computer stopping at 75 means nothing about your knowledge or you ability to be a nurse. REMEMBER THAT! I could simply mean you don't know yet how to answer the NCLEX questions. The first time I had the max questions, second time 75 (or really close, wasn't exactly watching...) and third time 75 (for sure, because I just sat their going... NO! Don't give up on me!!! I want MORE questions!!!)... anyway...
I highly recommend using variety of study books and don't get caught up on any one topic. Do the quizzes at the end of each chapter (prior to reading it) and see how you do. I did that and read the chapters for the quizzes I scored lower than 80% on. I would do 2-3 chapters at a time then go back and read. That way I didn't have the questions and answers still in memory. If I still did poorly on the quiz I read the same topic in another book and took the quiz in it (I used Exam Cram-RN and LOVED IT!!!). I would also get my hands on a Kaplan NCLEX
book. It is wonderful for explaining the Exam its self and helping you read and answer the NCLEX questions. Even the one's that are not familiar topics you can generally work your way through them after reading this book.
I would suggest doing NCLEX questions on a regular basis so they get more and more familiar to you. Don't put too much on your results of a comprehensive practice test just yet, just do the chapt quizzes or use a CD that also separates everything for you (the EXAM CRAM-RN comes with a wonderful CD program as well as a tear out study aide sheet).
Trust me... if anyone knows how you feel about not passing the NCLEX it would me. Try to keep your stress level and self doubt in check! That too is very important. You really CAN pass this thing. And really doesn't have much bearing on what type of nurse you are going to be or what you know about nursing... just how you apply what you know to the NCLEX. And THAT can be adjusted!!!
If you have any questions feel free to ask. OR if you just want to vent, I can handle that too. I'm pulling for you and wish you all the luck in the world! You can do this! Remember that!