Great! You've been invited for an interview. What do you do next?
Preparation is the key.
Find out what you can about the people who are going to interview you. Look them up on Linkedin or Google them so you know what they look like and what they have done in their career.
Read the job and person specification for the job: make sure you understand what it involves and that it really is for you.
Arrive on time and dress appropriately for the job for which you are being interviewed.
You can find much more information and help at My World of Work - including a mock interview test and lots of hints and tips.