I wouldn't buy the pre-fab flash cards. I think I learned more from making them than I did from using them. I did them for EPs (red marker), Systems gouge (green marker), and normal procedures (Blue marker). I did it for every aircraft I have flown (T-34/T-2/TA-4/AV-8B) and it worked good for me.
I know a lot of guys who did the juggling thing with good results, but I can't do it even when I concentrate on just juggling.
I also think that it helps to study one flight at a time. Burn that flight into your brain before you brief. Be familiar with the next flight, but don't go much beyond that. It's not like college where you can "have a general knowlege" and BS through a test. It has to be stone cold memorization to the subconsious level.
Anyway, it works for me.
Oh, and learn EP number 1 for any plane. "If you move a switch, and something BAD happens....move it back where it was".