Congratulations on passing the exam. Air law is seen as the nasty one for some reason, maybe I am weird in actually liking the subject of law, I dunno! It is proably viewed as the worst, as for a lot of people, for me certainly, it was the first proper exam I had taken in the 15 years since I left school, and that may be a part of it.
What you touched on here is method of learning. As a trainee driving instructor I have studied these things to a point!( that is why I am still training) There are some people who can memorise vast chunks of information, and those like me that can't. My method of learning is to see what I actually know first, then read up on the subject, then have a go of a mock exam such as the confuser, and then learn about what I got wrong. This is my method, it works for me, but might not work for everyone, just a thought though!
A good point to also remember is that there are no trick questions in these exams, the idea of them is not to see what you can remember, but to see if you can apply some basic principles and rules to your flying. With that in mind you can actually apply common sense to SOME of the questions to get them right. Just as a for instance, QFE. If you are asked a question about it, then it probably be along the lines of what does it mean, and there will be a couple of red herrings in the possible answers. Ever wondered where it came from? Well the "Q" code came out of the second world war, and maybe the "FE" stands for "Field Elevation". See what I mean. Also worth remembering that we have multiple choice answers. so the correct answer is actually infront of you, so my advice, more than any other is RTFQ! Read The Flipping Question! (You can think it means something else if you want)