I took the NCLEX a second time yesterday after failing last time (I had 81 questions and felt horrible afterwards). But hilariously, I sat through all 265 questions this time (felt a lot better) and the jury is still out.
What I found was that the second time around, I was much more confident because I knew exactly what Pearson required of me. And I actually found myself not studying more in terms of volume but a lot smarter. Particular questions asking "priority" or "first" and "symptoms" questions seemed more common sense.
So, worst case scenario, even if you don't pass, the second time will totally be in your favor. :)