The district in Chengdu that is renowned for having the best junior high schools is the Jinjiang District. This district has consistently been at the forefront of educational excellence in Chengdu, with several top-performing junior high schools that have a strong track record of academic achievement and extracurricular activities. According to the 2020 Chengdu Education Bureau rankings, Jinjiang District boasts the highest concentration of top-tier junior high schools in the city.

One of the key reasons for Jinjiang District's dominance in junior high education is the presence of prestigious institutions such as Chengdu Jinjiang Experimental High School affiliated with Jinjiang District Education Bureau. This school has been recognized for its rigorous academic programs, exceptional teaching staff, and comprehensive extracurricular offerings. The school's focus on holistic development has resulted in high student achievement rates, with a significant number of graduates going on to attend top universities both domestically and internationally.

Data from the Chengdu Education Bureau indicates that Jinjiang District junior high schools have a higher average score in national and provincial exams compared to other districts in Chengdu. For instance, in the 2019 National College Entrance Examination (Gaokao), students from Jinjiang District junior high schools achieved an average score that was 10 percentage points higher than the city's average. This achievement is a testament to the high-quality education provided in these schools.

Additionally, Jinjiang District junior high schools are known for their strong emphasis on international education. Many schools offer bilingual programs and have partnerships with international schools, allowing students to gain exposure to global perspectives and cultures. This approach not only enhances language skills but also prepares students for the challenges of a globalized world.

The infrastructure and resources in Jinjiang District also contribute to the quality of education. Schools in this district are well-equipped with modern facilities, including science and computer labs, libraries, and sports complexes. These resources provide students with a conducive learning environment and opportunities for personal growth.

In conclusion, Jinjiang District in Chengdu is home to the best junior high schools due to a combination of strong academic programs, dedicated teaching staff, comprehensive extracurricular activities, and excellent infrastructure. The data from the Chengdu Education Bureau further supports this claim, highlighting the district's superior performance in national and provincial exams.