Examinees review before the exam at the Beijing No. 4 Middle School in Beijing, June 7, 2018. [Xinhua]

Ministry of Education issues an urgent notice to schools on Friday to prevent "gaokao immigration."

"Gaokao immigrants" refers to those individuals who lack a hukou (household registration) or student status in a province but still attend the gaokao, the National College Entrance Examination, in that province.

(Source: Xinhua)