With a score of 323, 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, a seat in MBBS is tad difficult. You might get a seat in Private Medical College under Category B and their fees might be around 30-40 lakhs. Now 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

Hello
gouri unni , If you got 323 marks in Neet ug 2020 and confused about college then i suggest you to use careers 360 NEET college predictor tool for predict college on the basis of your marks here:

https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer

Hope it will be helpful for you :)