Questions, questions, questions. Make sure you use MKSAP 2 for students (the blue one), as I was told the older green MKSAP for students contained discarded resident MKSAP questions that were too difficult for the student level. I went through MKSAP 2, did Pre-Test right before the exam (last 1-2 days), and read through most of the IM Clerkship Guide during the rotation.