In a 3 way tie between India, BD, Pak - Pak goes through since we lost to Pak
For a 3 way tie to occur, Bangladesh will need to beat Pakistan too. So Ind beat BD, BD beat Pak, and Pak beat Ind. Bonus point and NRR are taken into account then. Pak already have a BP. BD need to win against Pak and SL and score a BP in either one of those matches. Ind need a bonus point with Afghan.
It's really, really unlikely. India's going home.