The school was founded as a middle school in 1916 and upgraded as High school in 1935. In 1998 the school was again upgraded as a Higher secondary school. Two batches for Science and one each for commerce and humanities were allotted initially.Later in 1999 an additional batch was allotted for the science stream. By the grace God the school continues to harvest remarkable achievements in curricular.co-curricular and extra curricular activities.Bearing in mind the overall development of its students, the school provides a platform for various activities and clubs like N.S.S, N.C.C, SCOUTS AND GUIDES, RED CROSS,SOUHRIDA CLUB ,ASAP,CAREER GUIDANCE AND COUNCELLING,SCIENCE CLUB,MATHS CLUB,LITERARY CLUB,SOCIAL SCIENCE CLUB, VIDYARAGAM KALASAHITHYAVEDI,NALLAPADAM,HINDI CLUB, COMMERCE CLUB,ENVIRONMENT CLUB,HEALTH CLUB,WORK EXPERIENCE etc
During its HUNDRED years of existence the school's growth has been rapid and its performance has been proved remarkable. Tens of thousands of students who have emerged from the portals of MSHSS have gone on to make a mark for themselves in India and almost all countries abroad. The school has always played a pivotal role in exerting influence in the social,cultural,political and educational fields and stands in the front line in the sphere of education in central Kerala .
The school was found by the erstwhile members of the Knanaya community belonging to St.Thomas Valiapally Ranni in 1916 and is named after His Grace Geevarghese Mor Sevarious Metropolitan of the Knanaya Jacobite church.