i used some memnonics i found online. i don't know if this was how you were tested, but my tester would just sit there and say, "ok the patient has gone into this rhythm, what is it?" and hold up a picture. i'd say, "ok that's vt" and then he'd ask what i wanted to do about it.
i've been to about a jillion codes and not once have i been able to determine everything
that's going on, especially all that's pertinent to acls, because there's just too much going on in an actual code.
anyhow, here's the site. use it as a basic memory trick, but check it out against current acls first to weed out whatever's no longer relevant, so you don't learn excess info. so, for instance, you have "asystole," you think pea-- "problem, epi, and atropine." this method really helped me get it organized in my mind and it might work for you. best wishes on the next try.
acls.net acls algorithms