Air Law is very dull, which makes it hard to sit down and learn it, and there's a fair bit to learn for the one about how aeroplanes work (forgotten what it's called
). Neither are too bad, but they are probably the hardest.
The one that took me the most work was Nav, but only because I had to figure out the whizz wheel. That took me a while, but after that the exam was easy. Spent a fair bit of time on Met too, but I learned a bit more that was really necessary for that one. Tried to learn enough to be happy that I could understand what the assorted Metforms tell me - promptly went and got stuck under a TAFd PROB30 TS at Shoreham, so that plan didn't work