My nephews came to the US in their early teens as non English speakers. They struggled in some of the courses but still got good grades reported to their parents. So, apparently some teachers will put them on a bus together with other minorities and take them on a day trip to the museum instead of math class, but they would still get graded. They retuned back to Spain and had a very difficult time graduating from high school because of math. So I’m not sure how well of a predictor high school is.