Go read more than that

> States that more aggressively implemented the CCSS registered larger gains from 2009-2013. That’s an optimistic finding for CCSS.

Even they find that clear data that states implementing CCSS have better outcomes, only a few years after implementation, that correlates with how aggressively CCSS was rolled out in the state.

I provided this source because they're ideologically opposed to CCSS, but even they admit that there's a positive effect early in the roll out. The rest is them bending over backwards trying to explain why their own data doesn't actually matter. In short I cited them because it's one of the best cases for the antithesis of my argument and it still proves what I'm saying.

It's commendable that you'd cite an article that is biased against your viewpoint. But I still don't find the evidence compelling that there's been decades of improvement in math education results. They've been coming up with new "research based" techniques since what, 1960?