Hi Bharat, 

cutoff marks for NEET UG is very difficult to predict as it varies every year with the level Of difficulty and pattern of the question paper. If the paper is above average scoring aroung 475-500+ will get you into a medical college in your state. However if the question paper turns out to be easy a score above 550+ is required to get ahead of the competition and a seat in a good medical colleges in your state. However you can never be sure with these predictions. 

hope this helped. Keep working hard and you will achieve the greatest. All the best for your upcoming exams ! :)