There is no guarantee that the examiner will be highly objective or unbiased, there is no accountability mechanism in place and they can get away with anything. If we were such an objective and unbiased country, wouldn't we be at the top of every international ranking instead of the bottom? Wouldn't the world love us instead of hating us? The whole system is messed up, almost every other person is biased in one way or another, one can hardly find anyone who is highly objective/unbiased. Examiners are from this very society, we don't even know if they really check the papers and how much they are paid for it or how qualified they are. It is not an exam like GRE or IELTS or O/A Levels where marking is highly objective and there is a proper system of checks and balances for examiners as well as students.