This has no social but an administrative background, the school insisted. Parents however fear a social division of pupils based on their religion. A grammar school in Vienna’s Donaustadt district includes the religious beliefs of its pupils as a decisive factor in the composition of classes. This was reported by a concerned mother who spoke to the Austrian daily Krone. She had heard rumours that the classes of the lower school are sorted according to religious belief and confronted the director of the grammar school on the open day. The headmaster confirmed the procedure to the mother. https://freewestmedia.com/2022/12/09/vienna-school-sorts-classes-according-to-religious-affiliation/