The conclusions of this study seem rather obvious. Federally Funded Study: Common Core Sunk U.S. Kids’ Test Scores “Contrary to our expectation, we found that [Common Core] had significant negative effects on 4th graders’ reading achievement during the 7 years after the adoption of the new standards, and had a significant negative effect on 8th graders’ math achievement 7 years after adoption based on analyses of NAEP composite scores,” the Center on Standards, Alignment, Instruction and Learning (C-SAIL) preliminary study said. “The size of these negative effects, however, was generally small.” ...If CC Never Happened, Kids Would Be Better Off. That Common Core would turn out to be a big failure seems not only obvious now, but, but was obvious when it was implemented. Another stupid mistake lauded by a very stupid education establishment. No wonder US schools suck.