"Student grades" refers to the assessments or scores given to students based on their academic performance in school. It is a way to measure how well students are understanding and completing their coursework. Full definition
I have also taught Psychology to high school students and have been a school counselor for students grades K - 12. (kkjpsych.com)
Typical examples are a report on trends in student grades after a new model of feedback or a report on the connection between student report of teacher practices and test scores. (eskolta.org)
The reading effect represents a gain of about four months of learning, depending on student grade level and background. (educationnext.org)