Tianjin 12 schools with 8863 students. According to official website's inquiry, the difficulty of the entrance examination for senior three in key schools in 12 districts and counties is still much higher than that in Tianjin College Entrance Examination, and the number of participating schools has increased to 36. The so-called 12 joint entrance examination for key schools in districts and counties refers to the joint entrance examination in which key high schools in 12 districts are responsible for the proposition except for 6 districts in the city, and other schools participate together, which is basically equivalent to the same model.