I don't know, but I was doing them, and some of them are really hard. I love the explanations though. What I've been doing is I finish the passages, then I go to the answer page, and before looking at the answer, I solve the question again in my head, and then I look at the explanation. I keep going further so that if I learn something new during explanation of an answer, I'll get it when I do the next problem. In effect, I do each problem twice (once to get an answer, and once while reviewing). But I was also curious where TBR review passages rank with AAMC.
