SIS Switzerland School Locations SIS Zürich-Wollishofen Education Levels Bilingual learning on a daily basis, introduced as early as in kindergarten and primary school – education for life.Find out everything you need to know about the education levels on offer at SIS Zürich-Wollishofen. Learn more about the continuous education from preschool to college offered at SIS – one of the major advantages of our bilingual educational concept. The SIS Swiss International School Zürich-Wollishofen offers bilingual education from kindergarten to grade 6 of primary school. On all levels, classes are held both in German and English. However, bilingualism is no prerequisite for admission.