Exams don't really show the ability of the student “Everybody is a genius. But if you judge a fish by its ability to climb a tree, It will live its whole life believing that it is stupid. ” - Albert Einstein.
Exams were never a tool to acquire knowledge and can never define someone’s intelligence or capabilities; setting a tree climbing assessment task to test the intelligence of a fish is just as inappropriate as setting a logical-mathematical assessment task to test the intelligence of a person gifted with interpersonal or with linguistic intelligence.
Moreover, Exams today test more on student's memorizing skills rather than what the student has actually learned from the course, Making a person more "book-smart".