I missed this Plugin for a long time, mainly because for many years it was difficult getting any teachers involved in the systematic use of quizzes which is where this works best. Now we have a few areas that totally understand that for their vocational students, studying for multiple choice tests, practice is one of the best ways of learning.
The progress bar provides an incredibly simple graphic view to students of what they have achieved and what they still need to do. Each block represents an activity (SCORM, Assignments etc also work) and it turns green when students have completed them.
I have used this with some very busy teachers who are only just getting into Moodle and needed to make it totally foolproof. I opened up the progress bar report and sorted it by progress, so the highest performing students appeared at the top. I then copied the URL and added it directly onto the main section of the course, clearly labelled but hidden to students. With a single click the teachers were able to see exactly who was ready to take the exam, and those who needed a little more support. The link should be similar to that below.
Here is a Youtube demo of the progress bar. Download the plugin here, https://moodle.org/plugins/view.php?plugin=block_progress