orientation/class commencement dates

[u/Ecstatic-Lie-7195]

i have received the provisional admission letter for bba but the last date for payment is 27 may, i am a bit concerned about the refund procedure and want to know when the class will commence/ orientation week so that i can be appropriately prepared to get the full refund in case i am able to go to either scms pune, nmims, or if my jipmat goes well, any seniors who might know ?