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I love hamstudy’s algorithm, that it feeds you back questions you missed later. I actually contacted them once to see if they could maybe also do aviation knowledge tests (which are formatted almost exactly like amateur radio tests; they’re both government ABC tests) but we tripped over a source for the question pool, the FAA doesn’t publish it.
It’s a great algorithm called spaced repetition. I use the method so much I discovered Anki (and its parent site Anki Web) to do a ton of university studies. There’s a small learning curve, but once you get it, you can make all sorts of flash cards with fine grain detail for spaced repetition.
As for the FAA, once you are past PPL, Sheppard Air is pretty much the golden standard, only there is no space repetition in their system.