Founded in 1930 by an English missionary, Miss Helen Jerwood, St. Thomas' Girls Senior Secondary School, New Delhi (Located at Karol Bagh and Mandir Marg) is an institution run by the Diocese of Delhi, Church of North India.. Dedicated to the education of girls, STS as we fondly call it, is recognized by the Department of Education, Delhi and is permanently affiliated to the Central Board of Secondary Education and prepares students for the All India Senior School Certificate Examination.