An interview is not only about what you say, how you answer, and what you ask. It is about your behaviour before, during, and after the interview, also during any breaks at an assessment day. Rasmussen College has produced this infographic on good interview etiquette.
Researching the company and the job is important pre-interview. Nothing puts off an interviewer more than knowing that the interviewee has taken less or no effort in doing some background research. Read how to do a good background research before an interview.
What to do Post-Interview
As shown in the infographic, do not tweet, i.e. stay away from social media in oozing out your feelings right away. See how employers use social media in the recruitment process.