I studied Flight Planning using AFT and then bought a set of Rob Avery practice exams. Big mistake! Not because Rob Avery's style doesn't work but because I was used to the AFT methods I simply couldn't follow through on his workings as the methods seemed alien to me. The answers were all the same though so I got it sorted in the end.
AFT was great but don't expect the two approaches to jive perfectly.
~FRQ CB