Citadel Residential School ? ?A castle of knowledge? located in the midst of a peaceful and natural environment at Ettichuvadu, Ranni is a Co-educational Christian Minority institution managed by the Catholic Diocese of Kanjirapally.

?Citadel? a name deeply embedded in the educational map of Southern Kerala was established in 1992. It grew and diversified to meet the changing needs of time and education with the introduction of Higher Secondary classes in 1999. Since its inception, it has evolved into one of the premier and leading institution of Pathanamthitta District imparting quality education It is affiliated to the Central Board of Secondary Education (CBSE) and follows the curriculum of National Council of Educational Research and Training (NCERT).
At Citadel, we join hands towards a better tomorrow, which blossoms from our vision and mission. The school makes every effort to form young generation who will build a more just and humane world. It strives for a scholarly venture that focuses on vital and original thinking, with the aim of societal transformation. The school makes a preferential option for all sections of society and it seeks to give an all round formation, inculcating both human and spiritual values. Proficiency, empathy and dedication are the hallmarks of the human person we seek to encourage.

Here learning is done in a congenial environment. Citadel indentifies the potentiality in each student, by imparting expert and activity oriented learning. Each child receives an education which is skill based that develops his critical and logical thinking. Each learner is helped to lead an exemplary life, a life enriched with not only wisdom, but also admirable values. The learners are engineered by dynamic people who are fervent instructors of wisdom and knowledge.