Communication Tips
Be enthusiastic about the school. Know why you want to go there and be able to provide 4 or 5 reasons when you're asked.
Always emphasize that you are seriously considering the program even if it isn't one of your top choices. If it isn't one of your top choices, don't say so. Consider your responses to questions beforehand, but don't practice too much because you don't want to look like you've rehearsed too much.
Have questions to ask. Ask about unclear aspects of their curriculum, research opportunities, and so on, but your questions should show that you are familiar with the school. Visit the schools website beforehand and use it to create questions. Good questions demonstate your enthusiasm and intelligence.
Bring up your strong points, but don't be overly self-confident. Try to strike a balance between self confidence and humility.
Be prepared for an interviewer to bring up your weak points or ask you for your input on your weak points.
Listen carefully to the interviewer and often you will get clues or hints as to what they are interested in.
Understand that some interviewers may not have read your application or may not recall it. Be prepared to fill them in on your qualifications and experience.
It's ok not to know the answer to a question. Just say so. As the interveiwer pushes you to the limits of your knowledge or experiene you will be in a position of having to say no. This means that the interviewer is doing his/her job properly and pushing you to find your limits. Dont take it personally.Work with them rather than against them.
If you did research, be prepared to talk about it. You should know the overall goal, methodology, what you found, and why it's important. Be able to discuss your part and contribution to the research.
Dress appropriately. Be neat and comfortable.
Try to relax and enjoy yourself. This is your time to shine.
Body Language
Body language is vitally important. Research shows that 55% of what is interpreted from our response is given by our body language with only 35 % of the message coming from the tone of what we are actually saying and the final 10% coming from the content of what we are saying. We must therefore be aware of what our body is doing.
Negative Body Language
Fidgeting shows restlessness
Crossing arms indicates an unwillingness to listen
Touching you face or playing with your hair can be a sign that you are hiding
something.
Looking away or hesitating before you answer indicates that you are unsure of
something.
Positive body language
Responsive/eager Leaning forward, open arms, nodding shows that you are interested and actively involved in the discussion
Listening Head tilted, constant eye contact, nodding
Attentive smiling and generally giving off a positive feel
Using Your Voice
You want to have a controlled steady voice that doesnt race off too quickly as the thoughts race through your head but indicates a clear, constructive, educated approach to an answer. Practice using your voice with different speeds and tones to find one that is most appropriate to the situation. If you were having a conversation with a friend about your favourite hobby you would be interested and actively involved giving your opinion. This is what you should try and use.
Use some of the following: 
Use a range of tones, avoid monotone
Pause before speaking
Speak slightly slower than normal
Dont mumble or gabble excitedly
Keep your hands away from your mouth as you speak
Watch your pitch and dynamics (high-pitched voices are tough on the ears)
Let your voice show your enthusiasm and keenness
Always look at the person questioning you
Direct your answer to the questioner
Glance around to engage the whole panel and form a rapport with each panel member.
When Delivering Your Answer
Keep to the point; be clear and concise with your response. Speak with confidence whilst keeping your answers positive. But do be honest and open with replies.
