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Quisition is a flash-card site that somehow knows how to test and retest you at the optimal time intervals for long-term memorization.  You can make your own flash cards or use sets compiled by other people.  To try it out, I compiled a deck with two subjects I sort of know (periodic table and Cyrillic alphabet) and two about which I hadn’t an inkling (Vietnamese food words and Tagalog vocab chosen for some reason, dunno, might be pairs of confusingly similar words).  It freaking works.  I know them.  I know them all.  I can’t necessarily pronounce them, but I will know until the heat death of the Universe that, for instance, peas are đậu Hà lan.  Literally, beans of Hà lan:  Holland peas.