St.Theresa High School(ICSE) Arul Colony (Co-Education) is a Roman Catholic, Minority Institution established by the Society of the Sisters of St.Ann, Luzern (SAL) on 15th June 1992.The Society of St.Ann was founded by Fr.Wilhelm Meyer at Luzern in Switzerland in the year 1909.

The School prepares the students for the Indian Certificate of Secondary Education (ICSE) Examination, through English Medium. The school aims at providing holistic education to all the students

For classes I to VII the Languages Hindi and Telugu are compulsory.

The students can opt for either Hindi or Telugu as their second language from class VIII.

Computer Applications is a compulsory subject for classes I to X.