Three years. According to China Education Network, the state stipulates that the college entrance examination should be reformed every three years. From 2023 onwards, the total scores of the candidates admitted to Beijing undergraduate colleges and universities are composed of three unified college entrance examination scores of Chinese, Mathematics and Foreign Languages and three graded examination scores of the ordinary high school level examination chosen by the candidates, in which the full score of each selected subject is 100, that is, the full score of college enrollment is 750.