Am I understanding this correctly? You are doing the PPL Air Law exam, I assume at a flying school somewhere, not the ATPL air law exam?
The place you're learning should go through the answers where you failed to see if you aren't grasping it somehow. Pretty bad to fail the ppl level exams as you should be getting more assistance with it than it sounds like you are.
It's not just a question of learning it parrot fashion, no matter what some of the above posters may say. You do need an understanding of it. I also failed Air Law a few years ago, pass mark 75%, I got 73%!!! Only one I failed tho so keep at it and you'll do fine.