Children who immigrate to Montreal, Canada go to school.

I think you'd better go as soon as possible, which is good for your child's English foundation. But in Quebec, most people still speak French, and many people don't speak English very well, including some children from China who have been here for a long time.

Speaking back to English, it will be easier for young children to learn, and it will be unfavorable to go there when they go to college. Moreover, even when I first came, poor grades were not very important. What matters is the last two years of high school, what kind of university you will attend in the future, and your college grades. Of course, everyone has different ideas. This is just my superficial view on this matter.