Hello aspirant!!

Do you mean that you got 345 marks in NEET exam ? If so then you might get private colleges for your NEET rank. It's difficult to get government colleges though you belong to SC category. 

Click below links for more details about colleges you get for your marks. 

https://medicine.careers360.com/neet-college-predictor

https://medicine.careers360.com/articles/neet-cut-off/amp

Good Luck.