Which version of the hard-pen calligraphy grading textbook is good?

Yan Weiping, a hard-pen calligraphy grading textbook, has a good version. Yan Weiping's edition is the designated textbook for the national hard pen calligraphy art examination. Based on the requirements of the examination syllabus, it emphasizes grading guidance, artistic characteristics, professional counseling and example evaluation to provide reference for the examination. Hard-pen calligraphy score refers to the examination of China's basic skills of hard-pen calligraphy organized by examination institutions.