Can I get govt medical college in kolkata .my neet 2019 AIR is 81000 and sc category rank 3500

Hey Suman !
An AIR of 81,000 belonging to SC Category might just help you to get through one of the colleges.
Following are some of the colleges in the state of West Bengal whose cutoff rank for the SC students under State Quota had been below than your achieved rank :

1. Bankura Sammilani Medical College.
2. Burdwan Medical College
3. Midnapore Medical College
4. College of Medicine and SagarDutta Hospital Kamarhati
5. Murshidabad Medical College
6. Maldah Medical College
7. ESI, Joka

Some of the above mentioned college had their SC cutoffs crossing 1 lakh rank.
You can go through the below mentioned link to have some idea :

https://www.google.com/amp/s/medicine.careers360.com/articles/neet-cutoff-west-bengal

Having said that, predictions might not be accurately true. It would be better if you wait till the State Merit List is out.

Hope this helps.

Best Wishes !