Please revise Inventory Management Concepts in Cost Accounting, they can be asked like:
Minimum Level, reorder level, Lifo & Fifo and Material accounting. As far as General knowledge you should be aware of Indian Defence, interior and foreign ministers. Recent Missile experiences by Pakistan with their names and Pakistani ambassadors to UN, America, NATO, UK.

Wishing you all very best of luck, I was confident of selection but to my despondence I am just over 26 years..