"One-day entrance examination" refers to the unified entrance examination for ordinary colleges and universities in China, which is often called the college entrance examination. Because the college entrance examination involves national candidates, the difficulty coefficient is relatively high. The difficulty coefficient of the college entrance examination is determined by the comprehensive consideration of the difficulty of the examination, the difficulty of the examination questions and the level of the candidates. The difficulty coefficient of the college entrance examination is between 0.3 and 0.7, that is, the average difficulty coefficient of each question is between 0.3 and 0.7.