NCSBN practice questions - scores and NCLEX results

[Agora]

I did UWORLD and my first time scores were above 71% and second round close to 90%, I am getting almost everything right on Saunders evolve resources and nurseslabs quizes and I felt very confident about upcoming exam till I started to do NCSBN questions. If I get lucky my score is 70%, but a lots of times I get 50 or 60. I feel that their intervention prioritization is a bit different than other websites. I am writing exam very soon and I am extremly worried right now because it looks like I have quite high chances of failing it despite straight A's in nursing school and encouraging results from other practice tests. It is not as much about the content which I know on the back of my head, but that standart decision tree I always used for all my exams and other practice tests seems to be useless with those questions. Since those questions are from NCLEX developers, should I expect similar disaster on exam as well?