According to your rank and previous years cut offs, you can get a seat in MS in Obstetrics and Gynaecology in:

Rajah Mutiah Medical College

North Bengal Medical College

But for Post Graduate Diploma in Obstetrics and Gynaecology, you can try in:

Medical College and Hospital, Kolkatta

Government Medical College, Tiruvanantapuram

Patna Medical College and Assam Medical College.

If you also want to know about chances in other specialisations, you can check our College Predictor:

https://medicine.careers360.com/neet-pg-all-india-college-predictor