by of immigrant students in hauptschulen were in such classes which were formally abolished in glenn and de jong an analysis of primary school catchment areas in four districts showed that one out of five schools enrolled twice as many students with immigrant backgrounds than lived in the area this is a consequence of parents circumventing official primary school assignment and schools offering ways such as separate classes based on parent choice of religious or foreign language instruction to attract native students and better teachers fincke and lange open society justice initiative it maintained the gymnasien which selected of their students with an extra reserved for siblings leaving selected by lottery basteck et al