I passed my COSH exam today with a very pleasing 95%. Not too sure how different COSH is from air law, but judging by the questions they are probably the same.
No real mysteries or surprises, my weak point is the 48.1 stuff, obviously the first couple of questions related to this, i started to panic but i only had the two.
Everything in the exam is covered in the course notes. It does really really help to be familiar with the material you take in. I printed out the extract and used it a lot, even though im pretty familiar with it i did double check a lot of things. If you are not familiar you will run out of time very quickly, i finished with 4 minutes remaining.
Great result! You're not alone in finding CAO 48.1 confusing. I don't think anyone can understand it with one (or two, or three) readings. If fatigue management is so important, why can't it be explained in simple English for plebs like us??