GoContractor provides several reports that provide the lifetime history of your users and the course history status. As an admin, you can download the course history report to an excel worksheet and manipulate the data to your needs to find the number you need such as the course completed in a date range or percent of courses completed so far.
Please note that our reports are for the lifetime of activity on your project or account. You will need to download and filter out what you do not need to view just the data you need.
To see how to do this please see our Course History article.