Hi there buddy,It is most likely that you can get your field of interest and in a very good college too For instance,based on the last year NEET PG Trend its seen that the candidate who scored rank of 20346 got MD Community Medicine in BJ medical college ahmedabad under all india quota and if you have state domicile, you can even get better colleges,besides BJ medical college itself is a good college and with your rank you have plenty of options for COMM Med, so its basically up to you to choose the college based on the criteria that suits you like the state or the distance from your home, dept staffs and quality etc, hope this helps,good luck.