In 20 19 years, the national average score of Mathematics Volume 1 was 74.438+0. 20 19, 26 provinces * * * use three sets of national examination papers, the difficulty of the first and second volumes is basically the same, and the estimated difficulty coefficient is basically maintained at 0.60. The difficulty of the third volume is lower than that of the first two sets of papers, with a difficulty coefficient of 0.63 and an average score of 90. The higher the value, the simpler the topic.