Is there a resource set that has NBME format question arranged by limited topic AND that has a good explanation for why the correct answer is correct? For example, you could select only questions that dealt with the heart? I'm on resource overload at this point and I know my learning style works best when I can put what I'm learning into the context of a question. Uworld did this for the MCAT but with no free trial, I am skeptical of spending $500 to try it out because everyone says that Uworld for med school is only relevant for dedicated step study.