National b volume. Official website of Anhui Education Bureau shows that Anhui does not use the national paper, but uses the national paper B. There are a, b and c papers all over the country, and the most difficult one is the national paper B. The main purpose is to make the college entrance examination more selective, and use the national paper 2 to select candidates. Among them, except for the 20 13 Anhui independent proposition, which is difficult, the national B volume has been used all the time. According to the form of college entrance examination in previous years, the examination papers used in the college entrance examination in Anhui Province are all national B volumes, so in 20021year, Anhui used national B volumes instead of the one with a large population in the college entrance examination. The National Unified Entrance Examination for Colleges and Universities, referred to as "College Entrance Examination", is a selective examination for qualified high school graduates or candidates with equivalent academic qualifications. National unified examination for enrollment of ordinary colleges and universities.