A photo gallery from the first practise session on Sunday.
The practise session gave competitors their first look at the UQ Centre at The University of Queensland, which is the venue for the competitive exams.
The session allowed the competitors to practise tasks that will be similar to those on the competitions exams with the help of their team leaders.
It also allowed the competitors to become familiar with the technology they will be using and the surroundings of the UQ Centre.
The session is also used to get clearance for any mascots, or other belongings that competitors wish to bring into the exams.
The team from the Ukraine collaborating together on the practice tasks. Members from the same country are split up for the competition exams.
2012 IOI winner Johnny Ho from the USA working his way through the practice exam in preparation for the 2013 competition.
Kangning Wang (left) and Mingda Qiao (right) getting ready to represent China.
Australian Team Leaders discussing the tasks with competitor Joshua Lau
Tunisian team member Meriem Chaabani trying to figure out a solution to the practice tasks
Juan Hoyos of Colombia thinking through one of the practice tasks in preparation for the first exam on Monday 8 July 2013.