Do transfer students do better in Maths?

Do transfer student raised outside of the United States get better Math grades than students born in America?

It is known worldwide that America specialises in education but there is also a notion that American primary to high school students are not as strong in Maths compared to students from foreign countries. Is this because they put more focus on subjects that revolve around humanities? Or are their Math standards just not as high? Either way, I want to find out if foreign students outside the United States really do get better grades in Math than those who have studied in America for most of their school career. I will only be collecting my data from students at ------- school because then it will be fair to judge peoples Math abilities. If I were to compare people’s data that are all from different schools, some people might have more mathematically vigorous courses than others. Another factor could also be that each school has different teachers so some might be harsher graders than others and it may not always accurately reflect a students Math skills, therefore in order to be concise as possible, I have decided to strictly compile all my data from the same school.
By collecting data from both students that had their primary and beginning of secondary education in American and foreign students at ----- school, I could see whether the common belief that foreign students do better in Math is true or false. After collecting the data of people’s country that they have spent the majority of their elementary to secondary career in, I will then split them into two categorical groups: Studied abroad labelled under ‘Foreign’(F) and Studied in America labelled under “Domestic” (D). For the students put under the “Studied Abroad” category, they were those that spent the majority of their high school career outside of the United States. After that I will collect their grades and specifically focus on Math, but will later on also observe other subjects