It can range from 5 to 15 in a batch of 460, depending on one's grades. In the first year, grades are averaged across 18-20 subjects. As a result, there are numerous opportunities to balance one's performance and maintain the minimum required CGPA. In comparison to other IIMs, an average guy can easily handle academic pressure at C. Despite the fact that you can see that over 95% of the batch has left. However, for some, it is too much to bear. Because it is a CGPA system, your grades are relative. Consequently, you must take care to avoid becoming one of the bottom 2-3%.
There is a system in place for extra classes taught by seniors for difficult subjects, but it all comes down to your level of preparation and how much effort you are willing to put in.