Generally when it is not mentioned the print out of Online application form is not mandatory only if you have the soft copy with you. But there is one suggestion just to avoid any kind of inconvenience keep a print out of the application form to submit when asked by the authority. If can't then also positively keep a soft copy of that. However all the marksheets and other documents should be available in hard copy either attested by gazetted officer or duly self attested by yourself following the instructions of concerning authority.