Why is there so much resting on these exams?

Why is there so much resting on these exams when?
Like how does exam results decide our fate, If we remember something 5 minutes after the exam is over, we are less qualified ans stupider than had we not remembered it 5 minutes earlier.
We all have different abilities, thought processes, experiences and genes, so why is a nation full of individuals tested by the same means???
If any of you are struggling with the exams give this a listen:

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