I prepped twice, 46 for one and 44 for the other, shortly before the exam. But in the exam, my V turned our to be only 40. There were few questions I saw before becaue at that time I barely started to work on the prep questions. The PREP should still have been a good indicator of my performance. Threfore, I was very disappointed at the final result.
The great difference I found between my prep and my real exam was in the RC. My RC questions in the exam were much easier, probally because I made a few critial errors during the ealier stage of my exam that reduced the overall difficulty of my question set and hence my overall score.