Confirm your interview date as soon as possible after being notified. Avoid altering the date you've been given by any means. This will look very unprofessional and should only be requested in the case of an unavoidable scheduling conflict that you may have to prove.
Purchase a business suit and have it sent to the tailors early so it's not on your mind while you're preparing for the interview.
Purchase four folders to use in preparation for your interview. Label them in them in the following order: 1) Admissions Materials, 2) School Information, 3) Key Psychology Courses, 4) Literature.
Collect all of the admissions materials you submitted to the school for the first folder. This includes your admissions essay and test scores. Print out any relevant information about the school, including faculty research that interests you, history of the school and an overview of their program to be placed in the second folder. For the third, collect notes gathered from key psychology course you've taken. This may include a general overview of psychological theories and models. Fill your last folder with a few of the latest industry articles and copies of the major psychology journals.
Study the material in the four folders as soon as possible. Focus most of your attention on learning about the school's program and refreshing your memory on psychological theories you may have forgotten.
Make a list of your research interests in psychology as well as what your professional goals are. Typically, you'll undergo an individual interview with the entire review committee for a little under an hour. To alleviate anxiety, practice standing in front of the mirror while talking about your interests and goals.
Prepare a list of questions you may want to ask the committee. Remember, though, that you should never try to dominate the interview process by forcing questions. If you're asked whether you have questions, it may be appropriate to pose one or two of them.
Get a good night's sleep the night before. Wake up early enough to lightly review the folders and have a relaxing, healthy breakfast. Show up 30 minutes early to settle in, but don't go over 30 minutes or you may bother the staff.
Approach the committee with a quiet sense of confidence and a lot humility. Greet each of them with a firm handshake and good eye contact. Repeat a comforting mantra to yourself while you are settling into your seat and take a deep breath.
Answer every question that is posed to you in a calm and sure manner. Try to be as succinct as possible while addressing each point and conveying you intentions and passion. Don't be overly outgoing and don't try to initiate conversation, especially if it's off-topic, unless you're directly prompted to raise your own questions to the committee.
Take a deep breath while you're getting up to leave. Give each committee member another firm handshake and a calm "thank you" as you exit.