Education at a Glance: OECD Indicators is the authoritative source for information on the state of education around the world. It provides data on the structure, finances and performance of education systems in OECD and partner countries.
With more than 100 charts and tables, Education at a Glance 2018 imparts key information on the output of educational institutions, the impact of learning across countries, and worldwide access, participation and progression in education. It also investigates the financial resources invested in education, as well as teachers, the learning environment and the organisation of schools.
The main message is that more effort is needed to improve equity in education. http://www.oecd.org/education/education-at-a-glance/