No they are not all boys or all girl schools they are only portrayed like that in the movies

Look it up

I'm a guy so I guess I'd go to Durmstrang because from what we know, it's a more masculine school. Beauxbatons would be cool though because it's in France, a place that I'd love to visit.

It is not all certain gender it is just dipicted that was look it up

I'm more of a visual person and i prefer the movies, so I'm just going to go off of what I see there.