Ooga
I'm year 10 this year in JMSS. All I say is be honest, open, friendly, cool (as in unafraid or calm), and just answer the questions with versatile structure. I mean to say that if you use just one way to answer all the questions the same way, they will notice a pattern and fire you because you really aren't supposed to study for the interview but they only want you to prepare your personality as best as you can.
:-)