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“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.”
The study found not only lower student achievement since Common Core, but also performed data analysis suggesting students would have done better if Common Core had never existed. The achievement declines also grew worse over time, study coauthor Mengli Song told Chalkbeat, an education news website: “That’s a little troubling.”
Federally Funded Study: Common Core Sunk U.S. Kids' Test Scores
In several cases achievement reversed under Common Core, and in every subject studied students would have been better without Common Core.
thefederalist.com
quite honestly i had problems with common core for many other reasons, but i assumed that it would at least show minimal growth or stasis
and, yes, this is one study but yikes