Agree with all alphaalpha says. I'm in the unenviable position of having to re-sit the airlaw exam soon as I originally took it 15 months ago (got only 80%)
I was dreading this until I did the test questions in the confuser for the first time recently (I didn't have it last year) and realised that most of the stuff I didn't understand first time around, and just 'memorised', now seems to make a lot more sense.
Still don't give a damn what year the Chicago Convention was signed in though!