The national volume generally refers to the first mid-term examination paper of grade one in senior high school, also known as "the mid-term examination paper of last semester" or "the mid-term examination paper of senior high school". This test paper usually involves the knowledge points of various subjects learned in the last semester of senior one, including Chinese, mathematics, English, physics, chemistry, biology, history, geography and so on. The exam is difficult, which aims to test students' mastery of knowledge points in junior high school and their initial mastery of new knowledge in senior high school.

The first volume of the country is of great significance to students. First of all, it is the first big exam in senior high school, which can help students understand their own learning situation, find their own shortcomings, and adjust their learning methods and plans in time. Secondly, the results of the first volume of the country will also affect students' chances of getting scholarships, being selected for academic competitions, entrance examinations, etc. Therefore, students should prepare for the exam carefully and strive for good grades.

It is also meaningful for schools to organize a national unified examination. First of all, it can evaluate students comprehensively and objectively, and understand the teaching quality and teaching effect of classes and schools as a whole. Secondly, by analyzing students' test results and mistakes, schools can adjust teaching plans and methods in time to further improve teaching quality. In addition, the first volume of the country usually sets open questions, which can cultivate students' innovative thinking ability and problem-solving ability.