Especially those questions that force you to identify a NEW sign of a murmur. First time I saw one of those I had no clue what the question was asking. For some reason the questions about the main COMPENSATORY mechanism for a certain valvular abnormality stump the hell out of me. I see an answer, think it's a result of it and not compensation for it, think it's wrong and pick something else, lo and behold that's the answer. Not gonna make the same mistakes again.