Maintain your composure
Many can't help feeling tensed when attending an interview. There are many methods of de-stressing and one of the most easiest and inconspicuous is to take a few deep breaths prior to the interview proper.
Speak confidently
Listen attentively and express yourself with Clarity and Precision. Always relate your answers to the job for which you are applying.
Maintain a positive attitude
Avoid saying anything negative about your current/past employers or co-workers.
Show interest for the job and company
Ask for further clarification if you are uncertain about the nature of the job you are applying for or about their expectation of you. At the end of the interview, remember to thank the interviewer for taking time to talk to you. Re-emphasize your interest in the job and your sincere appreciation for being considered.
Maintain your composure