CIS offers 'O' Level and 'A' Level curricula for the graduating classes and follows the UK National Strategy for the entire school. It is-a British Council-affiliated Centre for London Examinations with Edexcel International (Centre No. 93058) and for Cambridge International Examinations (Centre No. IN218).

Textbooks are carefully selected keeping the UK Examination Boards' recommendation and their national strategy in mind. All such textbooks are provided by the school to students up to the 'O' Levels, free of charge. Reference books of international standard are also available in the Library for the students to use.

CIS offers three academic streams: Business Studies, Humanities, and Science. The school's pedagogical philosophy is to impart quality education within the non-coercive regime of discipline, from Kindergarten right up to 'A' levels. Accordingly, the number of students per class/section is generally limited to twenty five. The school's academic record, at both 'O' and 'A' Levels, compares favourably with the best in the world.

All the conventional school level subjects are taught, besides languages, art and computer science. It has fully equipped laboratories for Physics, Chemistry, Biology and Computing Studies.

A unique feature of our school is that private tuitions are discouraged. Extra help is offered in all subjects during school hours as far as possible. Sometimes children stay back after formal lessons are over, to catch up in areas that need greater attention.

In junior classes, the children are not exposed to final examinations, and progression is based totally on their performance throughout the year. Final examinations start from Class 6 with the core subjects i.e. English Language, Literature, Mathematics and Science. For Class VII upwards, final examination is taken in all subjects.

A more formal approach to academics begins from Class VII. Instead of the integrated science course done earlier, they are now introduced to the three separate disciplines of Science, namely Physics, Chemistry and Biology. Projects, reference and research work, independent and group activities are encouraged.

Firm foundation for the 'O' Level board examination is laid in Class VIII. Children are offered a choice of subjects at the end of that year. CIS organizes an Aptitude Test along with Career Counseling to guide students regarding their choice of subjects for the 'O' Level course.