Through my The Resume Whispererbusiness I have been coaching people in preparing for interviews for a number of years. I have learnt alot through this experience and where people go wrong in interviews. For one, some people approach Interviews like they are going to war. They actually feel like they are going into battle. In some ways they are right. But its not the enemy sitting behind the desk that defeats them, its themselves.
The biggest mistake people make in going to an interview is not having a game plan or strategy. They think they are going to just "wing it". Anyone who is in public speaking will tell you that you cant go into an important speech without having prepared a script.
I mean do you think politicians ever just rock up with no idea of what they are going to say? No of course not. They have a list of items that they have prepared well in advance. Not only will they be clear about their position and what they want to communicate but they will have practiced saying it again and again.
There are a number of points you can prepare for an interview. Firstly, you should be able to talk about who you are and what your goals are. You have to at least be clear on that. So many people get caught out on the answers to questions that they should know. Its important to demonstrate self-awareness and understanding of what motivates you. If you can't show a potential employer that you have invested the time in understanding yourself, then they won’t feel confident that you are going to invest any time in their company.
Start with answers to these: What motivates you? What are your career goals? What are you good at? What are you bad at? What do you like, what don’t you like? Why this job? What's important to you in work and your personal life? You need to really think about these responses and write them down, so you can go back and modify them as you learn more about yourself. This is probably the most important aspect of preparing for an interview. Being clear about who you are and what you want. No one is more qualified to answer this question than you. An interviewer isn't going to give you a job if you don't even know why you want it.