The main reason for the lack of college entrance examination students in the 1980s is that the actual pre-examination (also called screening examination) system started from 1982, which eliminated 60-70%, that is, only about 30-40% of senior three students were eligible to take the college entrance examination. As for why we should take the exam, I think it is mainly to reduce the pressure of organizing the college entrance examination, because the eliminated part has little chance of being admitted to the university. At that time, the admission rate of college entrance examination was about 20%. If everyone takes the college entrance examination without preliminary examination, the admission rate will drop to about 8%!