I'm not sure what would happen to us if we didn't complete them at the job I worked before. Our supervisor just said they were mandatory and made everyone do them at a scheduled time so you really had no choice
Wish I had a way to skip exams though or could answer share lol
I'm not sure what the senior management would have thought about people sharing answers, but I think they really wouldn't have cared as I suspect the whole annual CBT thing was just a 'box ticking' exercise.