This report provides information on the structure of mainstream European education systems, from pre-primary to tertiary level for the 2020/21 school and academic year. It includes national schematic diagrams and a guide to reading the diagrams. It also contains a map visually showing the main organisational models of primary and lower secondary education in Europe: 'single structured education', 'common core curriculum provision' and 'differentiated lower secondary education'. The information is available for 43 European education systems covering 38 countries participating in the EU's Erasmus+ programme. The report's content is in line with the Eurydice Network's task: understand and explain how Europe's different education systems are organised and how they work. [For the 2019/20 report, see ED610856.]