I attempted national level exam of cognizant. After clearing written I had call for interview. Interview was nice. Initial questions were if I have any backlog or not. My interview was near to 50mins. Firtly they asked me about my project. What technology does it use?? What are cons and pros?? What else can be done by altering this project? ? What language you used?? Mine was python. So different modules I used I project were asked. There use and alternatives. Lastly datastructures.. Questions from trees There types and real world use.. How to make binary tree. From my resume. My internships and experience with them. Interests. One question from machine learning . (Basic one) Moral is: Nobody is going to help you there.. You should know what is asked and what it is. Thanks All the best.