The last exam I did was my PhD viva voce (if that counts). Being in work does seem to decrease the need for such things.
I stand by my assertion that significant numbers of untrained monkeys could pass some GCSE exams, although to my mind a lot of them are all about teaching the wrong thing. Maths for instance teaches a lot of formulas but little in the way of "number sense". Several of my colleagues for instance are smart people, but seem utterly unable to perform basic estimation. I don't know if any of you did (or have children who did) the Junior/Intermediate/Senior Maths Challenge papers - you had a paper of about 25 multiple choice questions, and fairly challenging questions. Yet the odd thing was that they never required particularly advanced maths concepts, they just required you to think laterally. Don't calculate the answer, work out which CAN'T be the answer. I tested myself on one of those after a few months at university and it was easy. Not because I'd learnt new concepts, but because I'd learnt to think differently.