DGE- The Directorate of Government Examinations, The Government of Tamil Nadu have constituted a new Board for School Examination viz "Tamil Nadu State Board of School Examination" by merging the existing two separate boards (1) Board of Secondary Education and (2) Board of Higher Secondary Examinations. Various Examinations conducted by www.tn.gov.in/dge
  1. SSLC Public Examination
  2.  Matriculation Examination
  3. Higher Secondary Examination (General Education and Vocational Courses)
Also started, National Talent Search Exam which is on 1st Saturday of December every year in Tamil Nadu. Also conducts various Diploma exams for teachers. 
The one good exam started by DGE is Tamil Nadu Rural Students Talent Search Examination (TRuST) is to identify the students of high scholastic achievement in middle school and give scholarship to them for higher studies. And The examination fee is only Rs. 7/-.
Also
Head Office
Director- Tmt D Vasundaradevi
Directorate of Government Examination,
College Road, D.P.I. Campus
Nungabakkam,
Chennai – 600 006.
Phone : 28278286, 28272088, 28269982

Also DGE have seven regional contact offices at Madurai , Coimbatore,  Tiruchirappalli, Tirunelveli , Chennai, Cuddalore and Vellore.