Does a high regional concentration of immigrants of the same ethnicity affect immigrant children's acquisition of host … exposure to a higher own-ethnic concentration impairs immigrant children's host-country language proficiency and increases … school dropout. A key mediating factor for this effect is parents' lower speaking proficiency in the host-country language …

positive effects of central exams on achievement tests, previous research on university-bound students shows no effects on … subsequent earnings. We suggest that labor-market effects may be more imminent for students leaving school directly for the labor … that central exams are indeed associated with higher earnings for students from school types directly bound for the labor …