Dear  aspirant hope you are doing well .To secure a seat in government medical college, a candidate must score minimum 610+ for unreserved, 580+ for obc, 480+ for Sc and 420+ for St category students for MBBS . As you secured 400 Mark in ug neet 2021 exam, as per previous trend , your chance are less to get government medical college. You have chance to  government medical college for bds courses.

To know the list of medical college you can get admission according to your rank, category and place, you can use neet ug college predictor tool. Link is given below.

https://medicine.careers360.com/neet-college-predictor?utm_source=qna&utm_medium=neet_cp

Hope it's helpful

Thank you