At GCA extra curricular activities are included in the academic mainstream. We have regular periods for singing, dancing, martial arts, games and library. Inter House Contests like quiz, debate, elocution, speech, cultural and games etc. are held to make the students capable in the competitive world in school throughout the calendar year. Other ventures in E.C.A are:

• Regular participation in debate, speech, elocution, quiz, singing, dancing, karate and games competition organized by PABSON, N-PABSON, Dist. Edu. Office and other organizations.
• Vocational and Pre-vocational classes such as knitting, cooking, tailoring, gardening etc. provided to interested students.
• Winner in many of the events in the past and present year.
• We have facilities for cricket, basketball, football, table-tennis, volleyball, badminton etc.
• Fully equipped cricket team which has participated in district tournaments.
• Organizer of first ever Inter School Boys and Girls Cricket Tournament in Kathmandu.
• Organizer of Inter School Literary Quiz contest on the occasion of  Bhanu Jayanti.
• Encouragement to the talents of individual at every level.
• Full time teachers for dance, singing, games and other activities.
• Weekly P.T. and Drill training helps student to be physically fit and disciplined.
• We have the membership of local swimming pool for our students and they have weekly swimming class in summer.
• Certificates, awards and prizes are given for each event at the end of the session.
• School function is arranged on all National days.
• School Fete, Parent's Day, Science exhibition and Saraswati Puja Celebration are other main attractions of ECA.
• Training conducted on various matters such as health awareness, natural disasters, hidden talent, first aid etc. annually.