Learn your seperation distances and all the iaco annexes. Thats about 10% of the exam (the one i sat). Then feedback is a great help with the rest. Although i agree the feedback can get you through for a nice exam, even the OAT feeback dosn't cover everything (and didn't in my exam).
I hated airlaw and to be honest would have quite happly failed the rest in that phase if i only passed that one.
Some people seem to find it a easy subject but struggle with the tech subjects and others the other way around. Although instruments was a bit of a bitch as well.
I found it a bit of a anticlimax getting them all because as soon as you have passed, the next challange soon focuses your attention.
Good luck
MJ