I also do not have specific data, but when almost 1/10th[1] of the student body is learning in a second language, it's obvious that test scores will be lower an

I also do not have specific data, but when almost 1/10th[1] of the student body is learning in a second language, it's obvious that test scores will be lower and resources will need to be stretched a bit further and certain groups(such as gifted) will not receive the best possible education for their unique abilities. [1] https://nces.ed.gov/fastfacts/display.asp?id=96 https://nces.ed.gov/fastfacts/display.asp?id=96