Laichtown,
By far the best route to prepare you for all the exams (after reading the books of course) is
www.airquiz.com
For £3 you can sit as many airlaw exams as you like.
What a site like this does for you, is make you very quickly realise what you don't know. You then make the effort to remember those particular points.
There obviously is an tendency to learn the questions, but that is not the objective, ideally you are looking for questions that you get wrong not right.
It will also throw up question that you will not find in the text books. For example one question I has was what is the VFR speed limit (under a certain FL, I think). I thought the question was a joke, a speed limit
So how many people know the answer?
Give it a go you will find it very helpful.
cheers
JP1