To get ready for an interview you must prepare yourself to speak confidently with the interviewer.
Preparing for an Interview
1) If you are shy, you must at least "pretend" to be comfortable speaking with the interviewer. PRACTICE answering questions out loud in front of a mirror.
2) If you are not confident, prepare yourself by doing research on the job, position, or college. This will also help you appear more knowledgeable.
3) Make sure you also think about your personal qualities, experiences, and expectations.