Why do college entrance examination immigrants change their ID cards?

Ensure that the college entrance examination registration information is accurate. The college entrance examination needs to use the information of ID cards, so immigrants need to change their ID cards to ensure that the information is consistent with the current situation. The migration of college entrance examination is a very complicated social phenomenon, which has both internal and external causes of education. From the inside of education, the main reason is the unbalanced allocation of higher education resources in China.