The newest batch of ACT scores shows troubling long-term declines in performance, with students’ math achievement reaching a 20-year low, according to results released Wednesday.
The average math score for the graduating class of 2018 was 20.5, marking a steady decline from 20.9 five years ago, and virtually no progress since 1998, when it was 20.6. Each of the four sections of the college-entrance exam is graded on a 36-point scale.
“We’re at a very dangerous point. And if we do nothing, it will keep on declining,” ACT’s chief executive officer, Marten Roorda, said in an interview.

www.edweek.org/ew/articles/2018/10/17/math-scores-slide-to-a-20-year-low.html
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SAT scores also dropped post-Common Core until it fully implemented a new version tailored for Common Core. How convenient. Even after the test was overhauled to match Common Core, average test scores increased by 0.7 percent in the most recent results. It represents almost no difference to pre-Common Core results, and the public can’t know exactly how the scores were recentered and altered, either.
In all the previous SAT overhauls, average scores technically went up but statistical analyses show they’ve actually been steadily losing ground over the past 60 years. In other words, the SAT has a history of score inflation, and Common Core is doing nothing to reverse that.
thefederalist.com/2018/11/05/9-years-common-core-test-scores-indoctrination/

The SAT scores dropped dramatically as-well, until they modified the entire SAT test to dumb it down for common-core.
They basically had to put a bell-curve on the SATs.