ST category requires only 96 marks to qualify NEET 2019 exam and you are way ahead than that. You'll easily end up getting a good rank in final result but depending on past results  MAMC in 2018 results admitted last student with 62 rank and 662 marks. It is the best college for MBBS after AIMS. Your ST Certificate will help you get into this college as you've scored a really good rank. Don't miss the counseling sessions. Good Luck.