Hi Nandu, 

You need to put the percentage instead of the total marks. Do not worry. there is nothing to fret about as you have got a second chance of mending your mistakes. You can make all the corrections you want to in the application form of NEET UG during any day betw 15.3.2018(Thursday) to 17.3.2018 ( Saturday). That is today is the last date. Please do your corrections immediately as the window will close after today. 

hope this helped. All the best for your upcoming exams. :)