I guess, CIC requires post school certificates and degrees only. But still, check it with them if they require school mark sheets; apply for the duplicate copy asap. However, getting duplicate copy of mark sheet can be a bit complicated task as I have been through this process. Sometimes, I wish for a service that would provide services for individual document management. Considering my inability to manage papers in an effective manner, one of my friends suggested me to join page on facebook, ‘clip to click’ where people discuss about effective ways of document management.