KSP is organized by MFF UK and it does two primary things:
I was doing KSP as high school student and after comming to the University I started to organize it (after autumn camp 2011). In years 2012-2017 I was leading organizer, now I am something like "Elder org".
KSP really helped me to lear a lot from computer science and it gave me a community of friends. If you are considering what to do and you are a czech speaking high school student, definitely try it :)