The document summarizes the structure of education systems in the United States, United Kingdom, and Mexico. In the US, education is typically divided into elementary school (preschool-5th grade), middle school (6th-8th grade), and high school (9th-12th grade). In the UK, education is compulsory from ages 5-16 and divided into primary, secondary, and sixth form college or university. In Mexico, basic education typically includes primary school (ages 6-12), junior high school (ages 12-15), and high school (ages 15-18).