I got an email for an interview two days ago. What do i need to do to prepare for it? 
Normally, you just want to prepare for common interview questions such as:
Why should we enroll you in JMSS?
How do you see yourself in 10 years time?
How can JMSS help you?
Tell us about yourself.
You can look for more examples on other wbebsites or forums.
You'll also being doing group problem solving tasks where they assess how you work as a teamplayer, how you cooperate, how you solve the task as a team. Things like that. Just try and give off the impression that you're intelligent and your passion for science while showing that you can work in a team.
Please feel free to correct or to add anything that I may have included/not included and all the best to everyone who got an interview.