A student loading the "Grades" page sees a table showing every gradable item in the course. These items don't appear to be in any particular order, and are not grouped at all.
Why it matters
Sighted users can quickly scan the page and find entries in the "Grade" column which are not blank. Blind users must either read every item, or skip directly to a course name they know.
Show quizzes and assignments in the same order as the course home page. Show different lists for assignments completed and not completed.