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There are two key websites that offer a multitude of data on high school performance and testing. One is the US National Department of Education
The other is devoted specifically to performance outcomes in Math and Science:
If you explore these sites, and link from them to others that you will find in their content, you will undoubtedly find what you are looking for, including test result data for K-8 and as well as K-12 grade levels in a variety of disciplines.
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