Why a third class is barrier to bank jobs?

It is a matter of sorrow for the job seekers that banks and other financial institutions don't allow candidates having one third division to compete for job exams, even if they have two first divisions. Students of lower and middle class backgrounds have to complete their education amid various difficulties. Out of bad luck one may get a third class, but that doesn't mean one is not capable of competing in the job market.
We earnestly request the governor of Bangladesh Bank to consider the case so that job seekers having one third division can get the chance to apply in all banks and financial institutions.