„Migrants who speak the host-country language are more likely to attain baseline proficiency (students who reach at least PISA proficiency level 2 in all three PISA core subjects i.e. maths, reading and science) than non-native-speaking migrants (8 percentage points more for native-speaking migrant students).“
OECD (Hrsg.), Unlocking the Potential of Migrants (2019), S. 58.