It turns out on this year's College Scholastic Ability Test the math section was harder than last year while Korean and English were easier.
The Korea Institute of Curriculum and Evaluation revealed the overall scores today a day before the test takers get their individual results.
The difficulty of the tests is represented by a standard score.
The standard score in Korean was 140, down 10 points from last year.
For math, one version of the test rose 10 points to 149, while the other went up a single point.
The agency said the test was harder overall because while it got rid of super-advanced, off-curriculum questions, it added more questions in the advanced category.
It said 15 students got perfect scores.