Jinkster,
Pick the topic that scares you the most or you understand the least or you find the most difficult. By doing your own research on this topic will give you the most benefit as you will learn the most - the object of the course! I don't think you're trying to cheat and if you follow the above advice you will get the most benefit out of the long brief prep...
I used spinning for the FIC, lots of good info on the net and in library books and the NDB hold for the IR/ME upgrade. Both subjects I was fairly clueless when I started and both I am a bit less clueless now!
Best of luck!
Regards......