COBACH (Colegio de Bachilleres) is a public secondary education institution in Mexico associated with SEP working under the SEMS (Subsecretaría de Educación Media Superior). It is a decentralized public institution created by presidential decrete in September 26th 1973. With 20 high school campuses in Mexico City^[1] and 27 in different states through the Mexican Republic. ^{[citation needed]}

It was established in Mexico City in 1973 during Luis Echeverría government to help cover the demand of high schools that offered a public service to workers and students therefore 20 campuses were opened in Mexico City and also a program (sistema abierto/ open education) for workers who could not attend school normally helping them to get a higher school diploma by taking exams after they studied text books at home or at work.

The first three campuses were established in Chihuahua offering two shifts, a morning shift from 7 am to 1 pm, and an afternoon shift from 3 pm to 9 pm.

|Sonora |Colegio de Bachilleres del estado de Sonora

Pagina del colegio - https://www.cobachsonora.edu.mx