Standardized tests show which students have well developed problem solving and critical thinking skills.

However, the best students on average have the worst standardized test scores.

A study of 182 students revealed something interesting. It showed that the number of books at home and studying a second foreign language are good predictors of student intellectual ability.

Krzysztof I. Rybinski; Does Standardized Testing Make Best High School Students Dumber?; Narxoz University; December 22, 2016