Hello dear student, 

As you told your marks are 315 and your marks are really very less. Sorry but with this less marks you are not eligible to get a seat for any government medical college and any government dental . Although as you have mentioned your category still you are not eligible to get a government seat. For your help I am attaching a reference link for your further help 

https://www.google.com/amp/s/medicine.careers360.com/articles/neet-cut-off-for-government-colleges/amp

I hope this was helpful .

Wish you luck