Then you may talk to the invigilator. As far as I know there would be no problem if you ask the authority responsible for conducting test. More over pls remember to take your admission card and identity card 

Yes absolutely. There is a correction and edit option. The corrections facility has been provided to candidates who have submitted their application fee and opted the exam city. Candidates have to login on the official website for correction. Candidates can edit and re-uploaded the images and edit their roll number feild as per the given specification by the authority.