It seems that a lot of people from my class that passed took the Hurst prep class. I used U-World and Saunders and they both helped me. I'm so sorry you didn't pass. I know the feeling. I failed my first time taking it, but never give up! You will pass it!!
I used UWorld and passed. Started in the 40-50's, and ended with mid 60's. My rank was 78th percentile and just found out I passed today! Hope you did as well