When practicing for an interview, you should focus particularly on the way you answer questions.
ONE
Be descriptive.
Don't just answer "yes" or "no" to questions. But also avoid "over-answering." Make your answers colorful but not lengthy.
TWO
Sell yourself.
Sell yourself to the interviewer, but without exaggeration or telling lies. You are there to market yourself, "blow your own trumpet" and explain why you'd be right for the role. But don't come across as arrogant.
THREE
Avoid negativity.
Avoid making negative remarks about your current employer, or past employers or colleagues. This will only reflect on you in the interview.
FOUR
Be determined.
Make it clear that you want to get the job, even if you are given information in the interview that sheds a new light on the role. Be positive, and then evaluate the opportunity again when you are away from the interview. Don't burn your bridges.
FIVE
Be positive.
Have positive body language, and maintain a good posture.
REMEMBER:
Expect unexpected questions. It's fine to pause for thought. It's also acceptable to admit you don't know the answer.