I have never met a Polish Gypsy who can't speak Polish. Have you?
Never, they're pretty much identical to other national minorities.
Even kids with minor disabilities attend regular schools so why would they put Gypsy kids in special schools unless that's necessary.
It's quite commonly reported - it seems that they get sent to those schools either very quickly, or they get sent there for bad behaviour while comparable badly behaved Polish kids don't. But it's not an easy problem to fix - the Slovaks in particular told the EU that they had already tried all of their methods 50 years ago and to stop trying to push solutions that simply don't work with them.
It's an old article, but it's the best I could find in English for the benefit of everyone else:
The project that I was talking about in Usti nad Labem -
- we really need more of this sort of thing, but not only for Roma kids, but for all children in Poland. I was involved with one such project before, but it didn't succeed because we couldn't get the funding to keep it going.