hi,
for memorizing information and processes I generally use a freeware flashcard program called Supermemo, it schedules repetitions so you will remember most the information with less time expenditure. To save time, it is best to first understand, then formulate mnemonics (preferably with peg words), then make flashcards in Supermemo that will help you remember these mnemonics.
with mathematical stuff, there is no substitute for just being able to do the problems. though learning this stuff should be done over a period of time. But by learning a bit every day, you may forget what you learned. So, I use supermemo to schedule problems for me to solve, as a kind of review.
hope this helps!
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