IME, The ATPL exams are about as difficult as sitting 10 or 11 GCSEs,
Some of it a bit technical, but not very, some of it dull, but just needs remembering. None of it needs any skill in reasoning. There is just lots of it. In the same way as I had to remember loads of useless info about WW2 to pass a GCSE in history, I had to remember loads of crap on the chicago convention for Air Law. I had to do some basic maths to pass a Physics GCSE, and I had to do some basic maths in Gen Nav.
To pass, all you have to do is tick a few boxes on a multiple guess exam, its hardly comparable to writing a final year paper.