St. Mary's Convent Inter College Prayagraj was founded in 1866 to provide an all round education to all sections of society, regardless of caste, creed or financial status. The children are prepared for the ICSE Examination (Indian Certificate of Secondary Education) at the class 10 level, the ISC Examination (Indian School Certificate) at the +2 level conducted by the Anglo Indian Board of Secondary Education Delhi.

The school is managed by the Sisters of the CONGREGATION OF JESUS in collaboration with a dedicated and competent Staff. This Institution established and administered by the Christian Society comes under articles 29 and 30 of the Indian Constitution, and for Religious Jurisdiction it comes directly under the Catholic Bishop of Allahabad. Though all are welcome, the institution is meant primarily' for Catholic children.