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In order for your students to see the grade, you'll have to post it by clicking either the individual "Post" button to post one grade, or the "Post all grades" button at the top to post all students' grades.
Checking if Students Have Viewed Feedback
Scholar will also report whether your students have viewed the feedback that you've left. To see whether a student has viewed your feedback, go into the Gradebook, then click on the Students tab.
Click on the relevant student.
Next to any assignment for which you've left feedback, you'll see an indicator of whether the feedback has been reviewed by the student.