The St. Thomas Higher Secondary School was established by the Mar Thoma Church Educational Society in June 1984 as Mar Thoma High School with the Bishop of the Trivandrum-Kollam Diocese of the Marthoma Church as its President and the Metropolitan as its Patron.

The school follows the 10+2 syllabus of the Kerala State Education Department. Our team of able experienced, well - qualified and dedicated teachers ensures quality education. But more than that, it helps promote the idea that the individual and the society are interdependent and that it is binding on the individual to make his/her contribution to the economic and social good of the community.

The school stands on a 30-acre campus at Mukkolakkal , adjoining Thiruvananthapuram city - about 1.5 kms east of Mannanthala Junction. Away from the noise and pollution that characterizes urban life, the campus with its panoramic landscape and lush greenery is indeed a haven to the student community.