Hi, 

304 is a less score for a dental government college. You may get admission in any private college because most of them take admission pn the basis whether the students has qualified exam or not and if qualified what's the ranking. So wait for results and check your ranking .You will get to know which college you will get. 

Good luck! 

yes there is a chance to get a seat for BDS. till then wait for neet result.here I am attaching a neet rank predictor tool.

 please check out this link

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

hope it helps

Good Luck!