The U.S. is in the middle of the pack when it comes to math achievement
Kernel densities of math scores on the 2012 PISA examination for various countries, including top-performing Singapore and bottom-performing Peru. The exam is administered to a representative sample of 15-year-olds in each country. The dotted gray line shows the estimated distribution across all 35 OECD countries.
Source: calculations based on 2012 PISA math results