St. Mary's Convent School, Sonatalab, a branch of the above school was established in 1993. The school stands for academic excellence, development of skills and character formation based on the love of God and the service of man as modelled in Jesus Christ, with a view of training citizens for all round development and sincere commitment to God and the country. It believes that a sound moral, physical and cultural training is as important as academics in preparing students for their role in life. English is the medium of instruction, communication and examination in this institution. Hindi is taught from L.K.G. onwards. It is a co-education school. Preference is given to girl child at admission. The school is a senior secondary school. The school has Science and Commerce stream, The School is affiliated to C.B.S.E, New Delhi having classes from LKG to XII Std.

Distinguishing Hallmark

1. Value-based and quality instruction.
2. Homely atmosphere (student-teacher friendly approch).
3. Disciplined and orderly procedure.
4. Activities aimed at all-round development.
5. Systematic Exposure Programme.
6. English Environment.