If your household registration is in Jiangxi, you can only take the college entrance examination in Jiangxi, and there is no need to read Guangdong textbooks. There are senior one students transferred from Guangdong in my class. Therefore, it is unwise to transfer to Guangdong to adapt to the new textbooks.
If your family can get you to apply to Guangdong in various ways, you can give it a try. However, the status of Shunde No.1 Middle School in Guangdong is not as good as that of famous schools in Nanchang, Jiangxi.