It's what you make it!

I attended Gakko France (2017), the summer before my senior year. Gakko was an eye-opening experience. The Sempais and the Kohais had very different diverse interests, education, and background. Which means that most likely whatever you are interested in, you will find someone to discuss your interest with and you will find something to do (maybe a small project related to it) during the program. That's why your experience at Gakko is what you make it while being fully supported.
It was also great to be surrounded by Sempais who were mostly university students or fresh graduates. This gave me plenty of opportunities to discuss my future and plan what comes after graduating high school.