In CIS, excelling in school is more than just going to class and achieving good grades; it is being able to handle class, work, and other activities without overwhelming oneself.

CIS believes that activities increase a child's confidence levels and teaches them responsibility and discipline. They can help children to hone their specific interests and fine-tune skills, to develop hobbies, which in turn, can pave the way for their future goals, dreams, activities and career. Participating in extracurricular activities inculcates lifelong friendships, complements academics and indicates a well-rounded personality.

CIS offers a wide range of activities for the children to choose from. It includes CRICKET, FOOTBALL, BASKET BALL, TAEKWONDO, SQUASH, TABLE TENNIS, CHESS, CHOIR, QUIZ, JAPANESE, PUBLIC SPEAKING, DIGITAL DESIGN, DUKE OF EDINBURUGH AWARD SCHEME, EARTHCLUB, PHOTOGRAPHY, LAWN TENNIS & GUITAR. Except Lawn Tennis and Squash, all the activities are held on campus. Timings are from 3 to 4 pm, Monday to Thursday, 2 to 3 pm on Fridays, and 8.30 am to 12 noon on Saturdays.

Students actively take part in the end-of-year concert 'Funtasia', school carnival and the annual sports. They also contribute to the school's yearbook, and the popular newsletter ‘CIS HERALD’.