>>240
Thanks for your reply. I was only thinking of flashcards since I had massive success with Anki in the past, in both language learning as well as memorization-heavy subjects, like biology and history. After playing around with it in math for a while, I quickly realized that cards that take a long time to answer or have a billion clozes aren't that great/don't work. Maybe cards querying the basic idea behind a solution to a DE could work? I just want to prevent forgetting things once I've passed the exam.
There's also this paper I found http://uweb.cas.usf.edu/~drohrer/pdfs/Rohrer&Taylor2006ACP.pdf (what about a card deck that just reminds you to do certain exercises or review them months after having done them?)