Worksheets and exams can show how familiar you are with the material, or they can be gamed or useless in some other way. But the best they can ever do is show familiarity.
What I really want as a consumer of someone's grade or academic history is how well they WORK in the subject area, along with how well they work with other people, not just a score that may correlate with regurgitation of facts.
I feel cheated by my school years, because I was led to believe that regurgitation of facts is very important. I also feel like this previous comment will be very emotional for some people.