Unfortunately, exams have to introduce “twists” so that not too many candidates pass. Let’s face it, Exam 5 material isn’t technically difficult and the pass rates would be insanely high (like 80%) if they didn’t have these twists and didn’t pressure candidates with time.
I do agree in that I find it annoying CAS has to resort to other ways to ensure enough people fail in each sitting. What I’m upset about is particularly for 2019 fall sitting. That was my second attempt (never failed an exam twice), and they failed more people than they’ve ever did in a sitting historically. Both times, I got a 5 but I felt pretty confident in passing in that fall 2019 sitting but still just got a 5. I wonder, had they kept the pass rate at 40% if my 5 would have been a 6.