Above average. 38 sets of Tian Li are suitable for the upper-middle level from the perspective of science mathematics and comprehensive management, and the difficulty is greater than 45 sets, which is suitable for the third year of senior high school. When all the question modules are mastered, they can also be used in the second stage of Senior Two. Tian Li 38 Episodes is an excellent supplementary book for students published by people in Xizang Publishing House.