Pull Request: C4_Husseny_505_Grades_List_4.31

Issue #505 
Reviewers: @rami-khalil @mohamedsaeed93 @mimikian @MohabGhanim @fadel1493 @Sharaf93 
for scenario in the assignment page try to view studentt's grade
then try to update the grade from the marking page and go back to students' grade view to see the update