The beginnings of the parochial school at Krosno are connected with the founding of the local parish. The decline of the school in the 18th century was a direct consequence of the opening of a Jesuit college, which attracted most of the eligible students from the Krosno parish. The dissolution of the Jesuit Order in 1773 failed to reverse the decline. It carried on until 1786, when it was replaced by a state school. Over its long history the school had no permanent seat, but moved from place to place. While lessons were taught in houses made available by the parish, teachers, cantors and boarding students were accommodated in the school buildings proper. Their condition varied a great deal, though it was at no time worse than in the 18th century. The students were residents of the parish, mostly from Krosno, of all ages under twenty (boys only). Although the curriculum changed quite often and depended on the knowledge and skills of the individual teachers, its core included reading and writing in Latin and in Polish, arithmetics, catechism, altarboy service, and church singing.