„Parents’ educational attainment continues to be a strong determinant of success in upper secondary education. Across all countries with available data, students whose parents have completed tertiary education are significantly more likely to graduate within two years of the end of theoretical duration than those whose parents have below-tertiary attainment.“
OECD (Hrsg.), Education at a Glance 2026. OECD Indicators (2026), S. 238.