Ability to gather and practice questions based on a word.

For example: maybe I feel solid in hematology except for Thalassemia. I would then go to the question bank, and instead of selecting a category, I would type in a little search box "thalassemia" (please make sure it is not case specific). It would then pull all the questions where thalassemia is in the text or it is an answer choice (even if it's a distractor). Then I can do a practice test focusing on what I really need to, not having to sift through the other topics that I am already comfortable in.