mdfb79

all are different levels of summarization.
Quicksheet  1 big sheet carrying the summarization of the curriculum. – cheat sheet for formulae, quick reference for some topic.
flashcards  are summarizations by LOS.
Secret sauce  is a cliff notes kind of book  1 book about 150 or so pages that summarizes the key points from the 5 books they send out.
of these, secret sauce is the most popular. flashcards are also useful, if you can read and digest preprinted flashcards, though most people agree writing out your own flashcards is more useful.
CP