I think Airlaw was the worst as most of it seemed to be of more relevance to an ATS unit than to a pilot. Ops procs had me glazed over on occasion, but it was interesting to get an angle on stuff like AoCs, NATS and stuff. However, on the whole I found at least something of interest in all the subjects with AGK (incl the bit on electrical engineering), Met, Gen Nav, PoF very interesting and full of stuff I always wanted to know about, but never got around to finding out. I think I even took quite a lot away from Human Factors that is relevant to business in general.