The school is affiliated to the Council for the Indian School Certificate Examinations which is one of the two recognized and approved All India Boards of Secondary Education.

The Council administers two public examinations – The Indian Certificate of Secondary Education (ICSE) at the end of class 10, and subsequently the Indian School Certificate (ISC) at the end of class 12. Both Examinations are held in March every year. The national admissions and accreditation agency in UK-UCAS has granted the ISC examination equivalence to British School Leaving Certificates. As a result, students with grades 1, 2 and 3 in ISC subjects will be eligible for direct admission to UK University without the need for A-Levels or bridge courses. The Council is the only Indian Board that has been accorded this status.

The ICSE syllabus provides for a balanced education, testing, understanding, and application of concepts. The students are examined in 6 subjects for the class 10 examination. The subject options are exercised in class 9. English, History, Civics and Geography, Hindi/Kannada & EVS are compulsory. The remaining 3 subjects are offered from a variety of options, such as Science, Mathematics, Economics Applications, Computer Applications and Physical Education. The subjects being selected need to be well thought out keeping future course of studies and careers in mind. Internal Assessment of every student comprises of 20% of total marks awarded in each subject in addition to all, students must pass in Socially Useful Productive Work (S.U.P.W) and Community Service.

St. Theresa’s School prepares students for the ICSE (Indian Certificate of Secondary Education). English is the medium of instruction. Hindi and Kannada are taught as second and third languages.