I've heard about Anki before, but I haven't tried this method of studying. Some questions related to mathematics I solved with the help of a tutor or various services, like WolframAlfa. Also, on this site, you can ask questions about mathematics (but not only), as on the Quora, and get useful answers and advice. Some useful information about Anki I found on Reddit: https://www.reddit.com/r/Anki/comments/43mf83/guide_how_to_anki_maths_the_right_way/ https://www.reddit.com/r/Anki/comments/47eyh1/anyone_here_use_anki_for_math_problems/