Hey Anitha,
For Obstetrics and Gynaecology 50% AIQ DNB cutoff for ST category for the year 2020 and 2019 were as follows-
These results suggest that a score of 320+ marks would certainly get you a seat for 2021.
For predicting colleges based on your DNB CET score you can use this college predictor tool- https://medicine.careers360.com/dnb-cet-college-predictor Hope this helps.
Goodluck!
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