Hi, 

With 320 marks in general category in NEET you may try in:

-B. J Medical College, ahemedabad. 

-I. G Medical College, Shimla. 

-Govt. Medical College, Trichur. 

The above data is as per last year's record.

Hope it helps please revert back for further queries. 

yes there is some chances for you  to get BDS in collges

However cutoff marks do vary every year depending on the difficulty of question paper and availability of seats here I am attaching neet rank predictor tool

 please check out this link

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

hope it helps

Good Luck!