Obersee Bilingual School is a bilingual day school at Sihleggstrasse in Wollerau, on the upper Lake Zurich shore. It takes children from three months in its Babycare group, then preschool, kindergarten, primary, middle school and upper school. Teaching is bilingual in German and English, and the programme follows the Swiss Lehrplan 21 alongside the international route. Students can leave with either the Swiss Matura or the International Baccalaureate (IB) Diploma. The school has 456 students, 63 teachers and nine teaching assistants. It is an IB World School, accredited by the New England Association of Schools and Colleges, and belongs to the Cognita group.