To view all your child's or children's grades at once, from your Dashboard, click View Grades:
A list of all your children and their current grade(s) displays. To view more details for a course, click on the name and specified course name:
From here you can see the score, the due date and the 'Out of' points.
If you see a speech bubble icon next to an assessment, that is an indication of a comment by the teacher. Click on the icon to see the additional comments.
Further, if a student is in more than one course, you can toggle between them using the dropdown at the top of Grades screen. This same principal applies if you are looking at a gradebook in a course that has multiple students you are observing.