Usually, students at the National Institute of Securities Markets (NISM) are unable to choose hostel accommodations without also having to pay the mess fees.
"Hostel Charges" and "Food Charges" are expressly combined into a single total amount in NISM's hostel fee structure. Both components are included in the listed fees, along with a breakdown for each installment. The hostel facility is available "with mess food and other facilities," according to student reviews.
Thus, it would seem from the information given that the mess service is a crucial component of the NISM hostel lodging package.