Regarding Photo Identification, you have to carry the document that contains signature and photograph that strikes resemblance with the photograph and signature that is affixed in the NMAT admit card. Even if you do not have such an Identity proof, carry along with you Aadhar card and also if possible an Id card which has the resemblance of the same photo and signature. If you do not have them, it is still fine. But just make sure that you have the photograph in spare to validate that both of them is you. Few tips for the exam day:

Do not sign on the Admit card before you reach the Exam center.

Check the Exam center location beforehand

Do not carry any Electronic Gadgets

Check the seating arrangement

There are lockers available and so you can put your personal belongings in the designated lockers

By any reason, if you are not allowed to the examination hall, please call the exam conducting body at: 9513850009 and report to the authorities by helping them with your GMAC ID.