The same way you should prepare for any other interview. Look your best, dress smart and bring your A game. They want to see that you embody their values: passion, hard work and constant improvement. They will most likely ask you for examples of times when you demonstrated qualities you have talked about in your CV or that are required for the job you apply for.
Make sure you know the company and industry
Assume you are starting on Monday or act extra excited.
Research the company
Find out what PHMG is about and how we have involved since 1998.
Look at your attributes and find the key points that make you the person for the role.
Research the company and industry. Understand your strengths and display them.