St. Sebastian's High School Koodaranji is a Christian minority institution under the patronage of Diocese of Thamarassery. It was established in 1948 and was recognised by Government of Kerala in 1962. It secured High School status in 1964 and Higher Secondary status in 1998. St Sebastian's High School with 1200 students,50 teachers and 5 non-teaching staff remain as an outstanding, exemplary institution in imparting quality education to economically backward, migrant people of koodaranhi village and its neighbourhood. Ever since the beginning it remains as the torch bearer in providing systematic knowledge, skills and values to the students. Specially planned extra curricular activities incorporated with SPC, Scouts, Guides and JRC aim at moulding , multifaceted personalities to face the challenges of the modern society. A powerful lighthouse never leaving the people in darkness.