I Get Nervous When I Go For The Interview And I Can Not Speak. How Can I Improve My Confidence?

A good way to improve your confidence for an interview is through the use of imaging. Before an interview, get an image in your mind of walking into the interview confidently. Imagine each phase of the interview and how you will respond. Picture yourself succeeding and doing well. By walking yourself mentally through the interview, you will feel more prepared. It may seem like a silly exercise but many successful people use the method - including Michael Jordan. He has said that before making a shot he would sometimes rehearse it in his mind and mentally see the basketball going in the basket. If it worked for Michael Jordan, it could also work for you.  

Repeat this exercise many times before the interview. Whenever you are feeling nervous, it can be a good way to calm your emotions. Like a dress rehearsal for a play, it can make you feel more prepared for the real thing.