If you are having the provisional certificate then also you will be eligible for CDAC Course . You have to be sure about your degree examination that all your papers are clear till date . If you are expecting any backlog in the current exam then better not to apply for CDAC as you will be disqualified if there are any backlogs .If you are not able to produce the Btech certificate with in a certain specified time ( you may contact the centre for the time limit) then also you will not be eligible to complete the CDAC course in spite of getting enrolled. SO better be sure about your degree then apply for CDAC Course