“first and second generation immigrants are, on average, better educated than the native population”
Non-native English Speakers in Primary Schools in England
“The study finds a modest negative correlation in the raw data between the educational attainment of native English speakers and the proportion of non-native speakers in their year group. This correlation is halved once the demographic characteristics of native English speakers have been controlled for. It disappears altogether once the type of school attended by non-native English speakers has been controlled for.
“This means that the negative correlation in the raw data reflects the fact that non-native English speakers typically attend schools with more disadvantaged native speakers. Once this fact has been taken into account, there is zero association between their presence in greater numbers and the educational attainment of their native English-speaking peers.”