Excuse me, can junior high schools in Sichuan directly transfer to senior high schools in Chongqing? thank you

Immigration for college entrance examination is not allowed. You'd better choose a better local school. There are also better schools in Chengdu, such as Shishi Middle School. If you really want her to study in Chongqing, you can set up a fake Chongqing hukou, or you can buy a house in Chongqing and get a Chongqing hukou. The better middle schools in Chongqing are Bashu Middle School, Nankai Middle School and Chongqing No.1 Middle School. However, the best school may not be suitable for your cousin. Her grades are not very top-notch, which may make her uncomfortable in a good school. I wish your cousin an early choice of a suitable school and success in her studies. I also hope you are satisfied with my answer.