Having gone through the 1000 SCs, I've hand picked 65 questions that I think are the trickiest. I did manage to get a few of these correct but, for the most part, these questions are pure evil
. I think if you can get over 50% correct and truely understand why you're picking your answers, then you are all set for SC.
If you press the show/hide button, you will be able to see the official answers. If you do a search for these SC's, I'm sure you will find a solution to them in the GMAT Club archives. Hope you find this document useful.