I don't know if some of the new questions are posted -- if they are, that would raise some copyright issues and potentially break the law, so I don't think they would be posted by any legitimate GMAT test prep company.
I can say: I wrote a blog article that (legally) lists all the Quant questions in OG 12 that no longer appear in OG 13.
https://magoosh.com/gmat/2012/sneak-peek ... tion-math/
I hope that's helpful.
Mike
