With a score of 320, your rank might be approximately between 213657-228146 . This is an expected rank range: https://medicine.careers360.com/articles/neet-result-marks-vs-rank . Now regarding the Colleges that you may have a shot at, you haven't mentioned your Category. But 320 is a less score for a seat in Government Colleges even if you belong to Reserved Categories. You will need atleast 450 and above irrespective of your Category. But with a score of 320, you can get a seat in a Private College.

Having said that, this is based on 2019 data and cut offs change every year. Cut offs change every year depending on various factors such as no.of Candidates appearing for the exam, no.of Candidates qualified, top NEET score and difficulty of the exam. For a complete list of colleges that you may have a shot at, please use our College predictor: https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer