In 1923, the school was recognized at the government level and raised as an aided school. Shri S. Parameswaran was Nair. The first headmaster. He managed to lift the region from the educational backwardness. After coming to the school in the morning, he went to the seashore, found the children and brought them to school.Initially it was from 1st to 5th standard. Then classes 6 and 7 started. The initiative for the growth of this school was taken in the 1950s by Rev. Fr. It was Sylvester Fernandez. Later, Poonthura St. Thomas School became the leading school among the 53 schools under the Diocese of Thiruvananthapuram. Started to educate the children of fishermen, students from all walks of life came forward to study in this school.

Poonthura region is the leading region in Thiruvananthapuram district in terms of population density. Christians, Muslims and Hindus live here intermingled. Being a very economically, socially and educationally backward area, it was only natural that unrest and unrest would arise from time to time among these sections of the population. Along with this, there have also been incidents where communal riots have been created by stirring up communal sentiments for selfish interests among different sections of the people and disrupting social security. In light of the realization that the main reason for this is lack of education, the then cabinet decided to allow more educational institutions in this country in the 80s.

Then the parish vicar, Rev. Fr. Under the leadership of Peter Gonsalves, RC Puntura St. during the year 1979-80 as per application made to the School Corporate Management Govt. Thomas U.P. The school was upgraded to a high school.Due to financial difficulties, most of the students quit their studies after 7th standard and took up traditional jobs. The parish took the initiative to start a high school as a solution to this.
Mrs. Jonah, who is serving as a doctor in America, M. Jesaphat, Joint Director of PRD, and Retd. Colonel S. Alphonse, Prof. Patrick James Gomes, Mr. Anthony Raju Ex-MLA, Mr. Poonthura Siraj, Ex-Mayor Mr. P. Max Well, President's Jeevan Rakshapathak awardee Coastguard Mr. George are alumni.