One of the pride of Seri Mulia Sarjana School is its outstanding, enjoyable and fulfilling Co-curricular Activities or CCAs which aim to promote teamwork, social skills, environmental awareness and inculcate community service amongst the students. In the secondary section, various CCA classes commenced on 19th January 2019. The classes are divided into different fields of interests wherein all students are required to partcipate in one (1) CCA which is included in the class timetable. The Arts and Culture category encompasses the following CCAs: International Culture Club, Rock and Pop Vocals, Musical Ensemble Club, Drama and Theatre Club, Art Avenue, Warisan Budaya, Dance Synergy and Lion Dance Club. The Sports CCAs cover: Basketball Club, Netball Club, Badminton Club, Futsal Club. The Islamic and Community Service includes: Red Crescent, Islamic Club, and Outreach Environmental Club. The Special Interest CCAs are: Atomos Science Club, Media Club, Techno Club, Mathematics Club, Press Club, Gavel Club, and the Environmental Protection Club.
