You want to appear eager and capable, not arrogant. As much as an interviewer is interested in what you did at your last job, what he or she really wants to know is how you did your job. Try to describe tasks that exemplify traits of a solid employee, like time management, organizational skills, creativity, or the ability to work well under pressure. Open-ended questions are where some candidates choke. What you shouldn't do is give a lengthy biography.
Nerves are a factor in an interview.
Most people are afraid of silence and chatter nervously while trying to formulate an answer. Instead, suggests Scott Wilson, campus recruiting manager at Electronic Data Systems, pause a few moments before answering. Interviewers sometimes ask candidates to tell a joke with the hope that it will reveal a sense of humor and test how well people think on their feet. Behavioral questions are a favorite tool among recruiters. These are questions designed to get candidates talking about past workplace behavior.