I always believed the Air Law exam questions are too hard and irrelavent for students at such an early stage in training.
Pre solo the student only requires the basics of rules of the air, aerodromes signals and collision avoidance.
Personally i would like to see simpler more safety related questions even if the pass rate req. was 100% for Air Law. Even if we had stock questions with known answers, what matters is that we all know the knowledge to fly safely.
Students don't have time to devote hours to studying and remembering information to pass a test. Knowing where to find the information 12 months from now is what is important.
The questions need only be put simply, with no tricks or twists.
Other air law questions could be included as appropriate to the Nav. Met. etc. exams.
But hey, we are only instructors and examiners..what do we know?
And for those that have had a life time of passing exams there are many who haven't sat an exam for 30 or more years.