According to the official prospectus available at http://bfuhs.ac.in/PMET20Online/Prospectus1.pdf . those Candidates who have not been allotted a seat in Round 1 can participate in Round 2 of Counselling. Those Candidates who also want to upgrade or change their allotted seat also can participate in Round 2 of State Counselling. But for that, you need to vacate your seat allotted in Round 2. With an All India Rank of 66591, you might get a better seat.