I took the shelf exam a couple of weeks ago and scored an 89, my highest shelf to date. I second the Kaplan bs book. The ethics and patient relationship chapters give you a list of rules to answer the questions. As I was taking the shelf I just followed the rules and it apparently worked like a charm. I also used BRS behavioral for questions,did all of the qbank behavioral questions, reviewed CNS pharm from FA and read the behavioral chapter out of USMLE secrets (this was all done over the course of a month, not the weekend before the test or anything). The thing that helped the most actually was doing 50 q bank questions and reading the explanations right before I took the exam. Good luck. It was probably the easiest shelf exam I have taken and if you read the kaplan or even BRS patient relations/ethics chapters you will do fine.