Even nonadopting states wrote new standards that mirrored key elements of CCSS. ... A decade later, scant evidence exists that Common Core produced any significant benefit. One federally funded evaluation actually estimates that the standards had a negative effect on student achievement in both reading and math.

What was wrong with Common Core?

Common Core has turned out to be an expensive disaster for America, with billions of tax dollars wasted on incentives for states to adopt the national standards, on developing and implementing new Common Core-aligned tests, and on ineffective curricula.

Did Common Core succeed?

The 2019 results for the IAR tests show just under 38% of kids passed the English exam, while about 32% met expectations in math. ... Several states that adopted Common Core early on dropped the standards and the Common Core tests. Many of their scores remain flat as well.