Tata Consultancy Services Assistant Systems Engineer trainee interview questions

I attended a TCS Prime interview, Questions were mostly about the new technologies and the different work situations which I personally think I answered well. Only few terms were asked which I have zero knowledge about, I even wrote the code they asked but I only got a Ninja offer. And some of my friends with bad interview experience got digital offer. I don't understand how they select the candidates. Very much dissatisfied with them. Never applying again.