1 class to class 3. According to the inquiry, according to official website of Peng 'an Education Bureau, Peng 'an Middle School 1-3 class is a key training class in Peng 'an Middle School, with rich teachers, experience and innovation, full of wisdom and vitality, which ensures the pertinence and timeliness of teaching in all subjects and makes outstanding students more prominent. Peng 'an Middle School in Sichuan Province is a provincial key middle school with fine traditions and school-running characteristics, and it is also the only demonstrative ordinary high school in Sichuan Province in Peng 'an County.