Hello Student

First of all congratulation for your excellent ranking in all India level Neet ug exam. You have mentioned that your rank is 678 in all India ranking. This ranking is no doubt very good ranking for getting  an AIIMS all India Institute of Medical science in India. But as you are interested to take admission in UG courses of Medical science in AIIMS Bhubaneswar, the cutoff for 2021 for AIIMS Bhubaneswar shows that for general candidate  is 576 in all India ranking so  you have a bright chance and you can take it' surely to get admission in AIIMS for MBBS courses likeMB BS BDS etc in AIIMS Bhubaneswar.

Hope this helps.