Hey
Yes with a score of 250-300 and being an Sc Candidate and state quota , you have some chances  of getting a seat in private colleges of karnataka. Or you can also get a seat in any Bds college of karnataka.
You can predict the list of colleges where you can get a seat on the basis of your NEET rank , you can use Neet predictor tool:

https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer

Hope it helps:)

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