My school used ATI and we all had to do the 3 day Live Review. Our graduation requirement was a 94% pass predictability or higher on the proctored comprehensive predictor. I got a 97% pass predictability and passed NCLEX in 75 questions. So far everyone in my class has passed, most in 75 questions. I hated ATI when I was in the thick of nursing school, but now I realize the questions and rationales forced me to use critical thinking, which will help when you are hit with higher difficulty questions on NCLEX. You can't study or know everything, it's about how you are taught to look at the information and synthesize it.