The OECD Programme for International Student Assessment (PISA) examines what students know in mathematics, reading and science, and what they can do with what they know. It provides the most comprehensive and rigorous international assessment of student learning outcomes to date. Results from PISA indicate the quality and equity of learning outcomes attained around the world, and allow educators and policy makers to learn from the policies and practices applied in other countries. This is one of five volumes that present the results of the eighth round of assessment, PISA 2022. Volume I, "The State of Learning and Equity in Education," describes students' performance in mathematics, reading and science; examines gender differences in performance; and investigates how performance relates to students' socio-economic status and immigrant background. It also describes how the quality and equity of learning outcomes have evolved since previous PISA assessments.