Good question. I can relate.
Some of my interviews gave me a tough time especially if they were big companies. You can check out these steps, they will definitely help:
- Learn as much as you can about the company
- Know more about the job description
- Practice interview questions
- Ask the interviewer some questions to show your interest in the company
- Dress appropriately
- Don't get to the venue late
- Be positive and confident

I wish you success in your next interview

Before you go for the interview,make sure you make enquire about the company goals and objectives. Dress appropriate and before you answer any question, think deeply within few seconds before answering those questions.
I wish you best of luck.

The main thing is to relax and be you! Prepare your energy, prepare for the most commom questions.
What are your strenghts and what are your weakness?
Ask questions, research the company.

Tell the Interviewer what you can bring to the table.
Make sure the company is the atmosphere you are prepared to be. This helps with your decision making.
The right one will not over pass you.
Best of luck on your highest best opportunity.

Simply.. talk to the interviewer as what they want not what you want, expect what they may ask you and practice the answers, so you can be confident

Smile as much as can, because its the best impression you can give

I enter each interview the same way thinking they already are interested, all I have to do is convince them. Your qualifications have already sold your ability, now they want to meet the person. I've been interviewed and done interviews, and at the interview stage it's 9 times out of 10 more about fitting in with the team over qualifications. If you weren't qualified, you wouldn't be in the interview. So be yourself. If you are not hired, it's not bad. You probably would not have been happy in the position if your personality didn't fit with the rest of the group anyway! Good luck!