Shubham! 

The cut-off rank for KMC Mangalore in All India Quota Counselling for 2017 was AIQR 491574 after Round 2(not after Mop Up Round). In order to secure an admission, you must get atleast 510-520.

More than worrying about marks, I suggest that you focus on the preparation for the exam. Check out this link for a few tips: 

https://www.careers360.com/question-im-in-12th-i-want-to-score-in-neet-but-i-havent-proper-knowledge-and-books-too-what-should-i-dohow-can-i-get-neet-related-pre-yr-paper?icn=question-title-details&ici=topic-detail-page 

 hope this helps