51 % of first-generation immigrant students (foreign-born students of foreign-born parents) failed to reach baseline academic proficiency in reading, mathematics and science …

„According to PISA 2015 results, on average across OECD countries, as much as 51 % of first-generation immigrant students (foreign-born students of foreign-born parents) failed to reach baseline academic proficiency in reading, mathematics and science, compared to only 28 % of students without an immigrant background.“
OECD (Hrsg.), The Road to Integration (2019), S. 36.
In Österreich ist die Differenz noch weit größer: 61 % der MigrantInnen der ersten Generation landeten zumindest in einer der drei Kompetenzen im Risikobereich, unter den 15-Jährigen ohne Migrationshintergrund waren es 24 %.