This is the first Dathaton in Bulgaria during 24-26 March 2017 in Sofia. Here is one of the cases for PISA  http://www.oecd.org/pisa/test/

You can see the data, the presentation and the case description here: https://gitlab.com/datasciencesociety/case_pisa

All of this is done according to CRISP-DM methodology that can be viewed here https://www.datasciencesociety.net/datathon-article-template/.