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A middle school (also known as intermediate school or junior high school) is an educational stage, which exists in some countries, and takes place between primary school and high school. The concept, regulation and classification of middle schools, as well as the ages covered, vary between, and sometimes within, countries.
In Mexico, the middle school system is called Secundaria and usually comprises three years, grades 7â9 (ages: 7: 12â13, 8: 13â14, 9: 14â15). It is completed after Primaria (Elementary School, up to grade 6: ages 6â12.) and before Preparatoria/Bachillerato (High School, grades 10â12 ages 15â18).