TL;DR - I would love to see a toggle option to hide or reveal answers on previously completed tests/practice sets.
In the LSAT course, Khan Academy emphasizes the importance of reviewing your tests, and trying to understand what you got wrong and why. This is extremely valuable advice, and I have incorporated it into my studying. However, once a test or practice set is completed, the answers are automatically shown (with explanations as to why they are correct or incorrect), with no option to hide them, and I think this can hinder the review process. I find it very distracting when reviewing questions, because I am not able to effectively reevaluate the choices, or to even try out the unanswered questions, without bias. Having the option to reveal the answers as needed would help me to consider the choices more fully, give me an opportunity to fix my mistakes (mentally), and also reveal where my strengths and weaknesses are when it comes to ruling out wrong answers. Thanks for your consideration, and for the awesome work you do in maintaining this site!