Dress formally - This is a professional position, and your appearance does make an impact.
Go online and research the agency and programs before the interview - know your interviewers!
Bring questions - You are interviewing them as well.
Plan ahead - They all want to know some basic things; your strengths, how you work in a team, your technical capacity for the position. Think about your answers before you get asked the questions. Make sure to think about how your resume fits this position, so you can show the interiewers how you fit their needs.
Practice - It may sound silly, but do some practice interviews with friends and families, it really will smooth over the actual interviews.
