Create a forum and enable ratings in the forum settings. Set it to average with a max grade of 5 or similar. I'd recommend posting as a student then rating that post as admin and as teacher so you have 2 ratings to sort. Posting as student then having the teacher and admin rate avoids having to alter the default capabilities for this test. Log in as admin and next to the rating drop down is a number that is the aggregate of all ratings the student has received. Click it and a popup will appear that lists the submitted ratings. Click the column headings (name, rating, time) and the ratings should be sorted. Note that it is not currently possible to reverse the sort order so clicking a single heading multiple times doesn't do anything. You'll only notice a change when you click a different column heading. Even then the order won't change if they are already in the correct order.