My sister is an IIM Ahmedabad pass out and narrated her experience of her first day at the prestigious institute.
Firstly you have to look at the seating chart outside the class. Once you enter you will find your name assigned to a particular seat. Seats are assigned on the basis of an unknown algorithm.
The first class is usually conducted by the Director Prof. Ashish Nanda. An alumnus of the institute, he is no less than a celebrity there. The students are excited to be in such a coveted place and taught by such an important person.
Class rooms are usually named CR1 or CR9. Find your own classroom beforehand and on the said date enter your classroom wel before time. You will be astonished to find that the class will have already been filled with eager students.