The Teacher Eligibility Test (TET) will be held at 12 centres from today to December 21, with 11 in Vizag and one in Makavarapalem, Anakapalle. A total of 26,248 candidates, including in-service teachers, will appear in two sessions: 9:30 AM-12 PM and 2:30-5 PM. District officials were directed to ensure security, medical aid, water, power, and transport.