This is an example of policy devoid of cultural context. East Asian societies, and Korean societies specifically have a history of examination as the main way to move up in class. During many dynasties of the past, if you could do well enough on various exams, you could potentially go from being low-born to serving in the court of a king. It is in this context that the current system developed. Thus, a simple policy change will very likely not work. It's a cultural shift that needs to take place.