[buddy i con]

I used to substitute teach high school. Those are not high school students. Too old, and frankly, too fit. Those appear to be screen captures from Youtube videos described as some kind of ''graduation'' of ballet or classical dance students. They are described in Russian, so it anyone's guess what those images really are, or where they were taken, but I doubt anyone as young as a high schooler appears in any of those images.

Real Czech high school students:

czechfulbright.blogspot.com/2020/02/czech-prom-season-story-of-feathered.html