Hello,
As you mentioned with ST category and 320 marks, your chances of getting a decent government college in your state through state quota(85%) are negligible.
However you might get some good private medical college in your state through state quota.
As the admission to medical colleges based on NEET is given unsed All India Quota(15%) and state quota(85%).

However cutoffs change every year depending upon level of toughness of exam. So hope for the best and follow the counselling process.

Follow this link to better predict your college-
https://medicine.careers360.com/articles/neet-college-predictor/amp

Good luck

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