I just finished evaluating a study aid for National Board of Medical Examiners shelf examinations. It’s called ExamGuru, an online question resource for the major specialty rotations encountered by a third-year medical student.
The surgery shelf exam has a total of 395 questions. You can create your own multiple-choice tests of any length, timed or not, and you can focus on the subsections of surgery you want to emphasize.
What makes this set of examinations unique is that you not only get the answer, you also can see whether the question is easy or difficult and how you compare to your peers who have answered the question previously.
Questions that are too hard or too easy are revised or replaced.