Mudan district no.21 middle school. According to the Notice on Inquiring about the Scribing Scope of Mudan District Middle School District, Mudan District Experimental Primary School, Mudan District No.2 Primary School and Mudan District No.1 Primary School all belong to the enrollment scope of Mudan District No.21 Middle School. A primary school is a school where people receive primary formal education. It is an important part of basic education and belongs to nine-year compulsory education.