But sir i tried during correction time ...there is no option for correcting any photo and signature...we only change our photograph when our photo dimensions are not correct or it was blurred ...i also try a lot to contact nta but no one response

Dear Sir/Ma'm, the correction portal for the National Eligibility cum Entrance Test form had been opened form the 14th of January to the 31st of January 2019 for all the aspirants who had made any mistake in filling the form during the registration time. Seeing your problem, I suggest you to visit the site for NEET and contact them.