Admission to high school in Sweden is based on the final grades from junior high. This article compares students’ final mathematics grade with new data from a high school introductory test score in mathematics. Both the grades and the test are based on the same syllabus, but teachers enjoy great discretion when deciding grades. The results show a substantial grading difference, consistent with grading bias against boys.
Reference:
Berg, Petter, Ola Palmgren and Björn Tyrefors (2020),
"Gender Grading Bias in Junior High School Mathematics".
Applied Economics Letters
27(11),
915–919.