1920 The Decision to establish an English Medium School at Keezhillam was taken of the visit of Titus II Marthoma Metrapolitan & Dr. Abraham Marthoma Suffrogon Metrapolitan
1922 The beginning of St.Thomas Middle School, Keezhillam under the leadership of Missionary Rev. C.I.Abraham with Mr. C.T.Mathew (Later the Rt.Rev. Dr. Mathews Mar Athanasius Episcopa) as a Headmaster. The boarding home was started with five students under the care and guidance of Mrs. C.I.Abraham.
1923-30 The construction of the main buildings of the school and the boarding home.
1931 Rev. P.C. Cherian was appointed as the Headmaster.
1947 School Silver Jubilee and beginning of the high school section.
1950 The construction of the new building for high school, boarding dining hall.
1956 Mr. George Cherian secured the third rank in the SSLC Examination.
1967 Mr. Philip John secured the first rank in the SSLC Examination.
1969 Construction of the football court.
1973 Kerala Governor Mr. N.N.Vanchu enaugurated the M.M.A.M. Hostel.
1976 Headmaster Mr. C.K.Thomas secured the national award for teachers.
1978-79 The construction of the new wing of the Jubilee Building.
1984-86 Rev. P.C. Cherian Memorial Auditorium completed.
1986 The inauguration of the Auditorium by Most Rev. Dr. Alexander Marthoma Metropolitan.
1993-94 Seating arrangements and curtain sets in the auditorium with the help of the PTA.
1996 Platinum Jubilee Celebrations.
1997 Inauguration of the computer lab.
1998 The beginning of the Higher Secondary Section.
2000-01 Construction and Dedication of the New Block for the Higher Secondary wing.
2003 Construction and Dedication of the High School Administrative Block.
2004 Inauguration of the new computer lab in the Higher Secondary Section.
2006 Inauguration of the new office for the Higher Secondary wing.
2007 Installation of the LCD Projector donated from the M.L.A. Fund. New school bus for high school section by the effort of LAC, PTA, Boarding Home and Staff.
2012 Navathi Year of the school.
2013 Rennovation of the Headmaster’s Office.