Students in the US are required to go to school between ages 6-18 in grades which run from 1-12. Primary, or elementary, education lasts from 1 to 5 grades, middle school covers 6 to 8 grades, followed by high school education from 9 to 12 grades). There is also kindergarten, for the year before the 1st grade, which is optional in most US states.
After finishing the 12th grade students have two options: vocational training (typically a year or two, designed for immediate employment in a trade) or higher education (typically a two-year associate degree or four-year bachelor’s degree in an academic program).
For students planning to get enrolled in higher education in the United States, US colleges and universities require 12 years of education, or secondary school transcripts to prove completion of the secondary education.