3-Greens,
I passed all the ALTP exams through self study using Avex notes, I've found by far that Avex covers the subject thoroughly and with good explanations. Although FTC typical exam questions parallel the real thing extremely closely, its worth doing them over and over agin, until perfected.
As for the worst subject- brace yourself for plotting!
The problem with this subject lies with CAA's multiple choice answers. For instance you will find that after doing a plot u end up with an answer that falls exactly between answer A and answer B.
So the moral of the story, accuracy, one has to be extrmely accurate when plotting and make sure that you use a very sharp pencil.
Unlike comm plotting you'll find that plotting in the high nothern latitudes can become interesting.
Good luck.
Oh and by the way I found that CAA's answers are based on a path finder (i.e TAS,RAS etc.) and not the'ol Aristo confuser.