Ok, so let me get this. The plan is to take people who the education system has failed to prepare for real life, put them back in school... and hope it goes differently this time?
Yes, they're rehabilitating NEETs, people who gave up functioning in society. It's supposed to help reinstate that thirst for a life that one used to have during one's youth but probably took for granted. Having it be in high school puts the experiment in a more controlled environment that inquires a lot of social interaction. The educational part is optional, as it's irrelevant at the end of the experiment, but how they choose to live the experience and affect their peers is a big part of the process.