In order to participate in the software project, you must have passed the programming exam. The programming exam takes place at the beginning of each semester and lasts four hours. More about the procedure on the official page of the last semester.
But this is nothing too wild and to make you feel well prepared, we have some samples from the last years (decade) here. Maybe Colis will tell you about their tasks from the last year.
The tasks are listed here as Postscript files.
On the pool machines you can see this directly, elsewhere you might have to get a Postscript-Viewer first.
You can find the solutions in all languages from Python and Perl to PHP and Java.