From my review quizzes, which spanned almost 300 of the 966 MC questions since 2002. (I had many versions. I don't make the kids do 300 questions!) I compiled a list of the 40 most missed questions (by my students anyway) in order. https://app.box.com/s/xddw0txo451ajjwkfgbz I also made a youtube video explaining how I think about each question with a little review snuck in. http://youtu.be/MeOpoRtHkLo The most missed topics by my students were Longitudinal Waves Vector Addition