Campion School was moved into an incomplete building on the present site in July 1974. In the same year classes from KGI to Std. III were added. St. Mary's School, run by the sisters of PSOL (Poor Sisters of Our Lady), Mumbai, merged with Campion and its students both boys and girls were admitted to this school. Sr. Eleanor, PSOL, was the headmistress of the primary section. The girls studied at Campion for a year or two before they were admitted into St. Joseph’s, Idgah Hills, or Carmel Convent School, BHEL.