Have you already had your interview?
Briefly, you need to go through the job description and think of a relevant example to explain how you can do that part of the job. It's no good saying 'I'm a team player,' you may as well say 'I'm a Paratrooper,' you need to give a valid example, so think of a time when you drove the team forward, or added something unexpected to the project.
Use that example for all aspects of the job description.
Take you time answering the questions- they've had weeks to think of the questions, take a breath before answering- you'll look like you've really considered your answer & don't make impulsive decisions.
& most important of all- if you don't have a good feeling about the job, don't accept it- you're interviewing them as much as they're interviewing them.
Good luck & let us know how you get on.
Gemma
Mercy : Design Agency, Literature & Arts Collective : London / Liverpool : UK