1. Overall, when going for an interview, don't create it as a hype to lose your grip. Rather just pretend and believe it's something interactive session through which your recruiters wish to know about your compatibility with the profile. 2. Just relaxx sit straight and confident and most of all in a position you would be sitting comfortably too. 3. If possible you could maintain a cute short smile according to rhe situations that take place there. Implying don't bring out what's going on inside your head on to your face. 4. You need to decide quick whether an answer needs to be manipulated for their good or stated as straight.