The Directorate of Matriculation Schools, Tamil Nadu is an accreditation and governing body for secondary schools in Tamil Nadu, India. In a concept unique to Tamil Nadu (within India), until 1971 Universities also governed secondary schools, and such schools were accredited to the Matriculation system. About 5% of schools in Tamil Nadu fall under this system. Schools use English as the language of instruction. They have a unique curriculum until class 10 and follow the Tamil Nadu State Board curriculum for classes 11 and 12. Schools are accredited on an annual basis.