Hey Bipin,

To be a cadet at National defence academy it is important to develop the overall skills and personality, it's not only about studies. For entrance exam just go through the course of 11th and 12th properly, that will be enough. And also be aware of basic history, geography, pol. Science and current affairs, that's all. Be confident in what you want to convey in a conversation and also work on your fitness, mentally as well as physically. Hope this helps, thank you for asking question here at careers360.