The first volume of the country. The national A-level exam refers to the highest-level exam at the national level in China, which is also commonly known as the "National A-level exam". These exams are so difficult that usually only top students can pass. National Examination A covers all subjects, including Chinese, mathematics, physics, chemistry, biology, geography, history and politics. In China, the national Grade A examination is usually the basis of important examinations such as the college entrance examination, postgraduate entrance examination and doctoral entrance examination.