Difficult. Specialized courses are different from teaching theory, and there are three levels of subjects under normal disciplines, including curriculum theory, teaching theory, subject teaching theory, Chinese teaching theory, mathematics teaching theory, physics teaching theory and chemistry teaching theory. Beijing Normal University is a national key university directly under the Ministry of Education of People's Republic of China (PRC), which is jointly built by the Ministry of Education and Beijing. It ranks among the national "double first-class", "985 Project" and "2 1 1 Project" and is one of the first ten key universities built during the Seventh Five-Year Plan and the Eighth Five-Year Plan.