St. Thomas Higher Secondary School, Mairang, established in 1972, is a Catholic Institution, under the jurisdiction of the Diocese of Nongstoin. It caters to the educational needs of the boys and girls of this area, irrespective of religion, caste or community.

The aim of this school is to impart sound intellectual, moral and physical education to the pupils so as to make them good, useful and responsible citizens of India.

Hence, particular attention is given to discipline and character formation by means of religious and moral instruction.