Hello, 517 marks in NEET is a good score. The admissions are given in 15% all India Quota and 85% state wise quota. Further, the state wise quota is divided into Regional 70% and all over state 30%. Therefore, please decide how you want to get admission for MBBS. According to last year's cut off the following colleges gave admission to OBC category students who scored around 517 scores. 

1. Grant Medical College, Mumbai. (Cut off 503 - Regional Quota) 

2. Lokmanya Tilak Municipal Medical College. ( Cut off 501 - Regional Quota)

3. Topiwala National Medical College, Mumbai ( cut off 509 - Regional Quota)

4. Rajiv Gandhi Medical college, Thane (cut off 491- Regional Quota) (cut off 509 - State Quota)

5. Byramjee Jeejeebhoy Government Medical College and Sassoon General Hospital and College of Nursing, Pune (cut off 505 - Regional Quota) 

Please note that all these cut off marks are according to the year 2018 and there might be a difference of 5-10 marks as minimum qualifying marks. For more information about cut off marks and colleges in Maharashtra please visit the following link 

https://medicine.careers360.com/articles/neet-cutoff-maharashtra

Hope this information helps you,

Good luck!