1. Differences in educational resources: There are differences in educational resources between Gansu and Jiangsu. As a developed area, Jiangsu has many high-quality educational resources, many famous schools, high-level teachers and advanced educational facilities. The difference of resources will affect students' learning environment and education quality, and then affect students' IQ development. Students will get better support and training in the educational environment, and their IQ will also be improved.

2. Differences in family background: There are differences in family background between students in Gansu and Jiangsu. Family environment, family education methods and parents' attention to education all have an impact on students' IQ. Wealthy families can provide better educational resources and a better learning environment, and children's learning and development in the environment will be better and their IQ will be higher.