Uworld questions are very hard, I faithfully completed all of them and by the time I was done still was getting as low as 40% but the final when you want to exit to see how ready you are, I scored 69 and gave me a green light to go do my nclex that I was above the average. I passed my nclex and believe uworld and rn comprehensive saunders helped me to pass. keep fighting those 40s are okay.