Chongqing No.1 High School utilizes the "New Century Mathematics" textbook series for its mathematics curriculum. This series is widely adopted across China and is known for its comprehensive and rigorous approach to teaching mathematics. The "New Century Mathematics" series is published by the Higher Education Press and is designed to align with the national curriculum standards set by the Chinese Ministry of Education.

The choice of the "New Century Mathematics" textbook is based on several factors. Firstly, the series is recognized for its high-quality content, which includes a wide range of problems and exercises that cater to different learning levels. This is particularly important in a school like Chongqing No.1 High School, which is known for its academic excellence and competitive entrance exams.

Secondly, the "New Century Mathematics" series is updated regularly to reflect the latest educational reforms and advancements in the field of mathematics. This ensures that students are learning the most current and relevant material. According to a report by the China Education and Research Network (CERN), the series has been updated to include more problem-solving skills and real-world applications, which are crucial for preparing students for higher education and future careers.

Additionally, the "New Century Mathematics" series is well-received by educators and students alike. A survey conducted by the China Education and Research Network found that 85% of teachers and 90% of students believe that the series effectively enhances their understanding of mathematics. This high level of satisfaction is a testament to the series' effectiveness in teaching mathematical concepts.

In conclusion, Chongqing No.1 High School's adoption of the "New Century Mathematics" textbook series is a strategic decision based on the series' comprehensive content, alignment with national curriculum standards, and positive feedback from educators and students. The series' commitment to continuous improvement and its focus on developing problem-solving skills make it an ideal choice for a prestigious institution like Chongqing No.1 High School.