Jiangjin middle school. Jiangjin Middle School in Chongqing is the first batch of key middle schools in Chongqing, including junior middle school and senior middle school. It is the best high school in Jiangjin, with strong teachers and first-class teaching team. Jiangjin district belongs to Chongqing, located in the southwest of Chongqing. It is named because it is located in the Yangtze River.