Great job to everyone who got an interview. It's you that deserve a place since you've all worked so hard. There is absolutely no need to freak out if you want to be confident in passing the interview. Be proud of your efforts so far and show yourself some respect for making it to this stage. By the way, I don't see the point in studying for an interview, especially with others, because the reality is that you will be competing with them soon enough.
Most of all it is important that you express your interest,passion and belief in Science. I hope that is what has drawn you into applying for this school. If by any chance Science is not your favourite subject at the moment, please don't pretend that it is at the interview. I've tried that countless times in many interviews prior to JMSS. Luckily, I had learnt my lesson by the time I took the interview for John Monash. It is best if you try to develop an interest for Science prior to the interview. I don't believe that anyone will truly deteste a subject if they attempt to connect and establish a relationship with it. Be yourself. Have an open mind and be able to approach problems in a wide range of perspectives. Remember to be friendly with everyone at the interview, even though they may be your competition at the time, they may as well be your friends next year.
Once again, best of luck to everyone.