To get an idea of how well your learners are doing in a course, you can take a look at their assessment results. You can follow these steps.
Go to the course in question by clicking on Training then Courses. In the Learners tab, click link beside the learner's email under Course Progress category.
Find the assessment you want to see the results for, and click Details beside the name, then click on Results for attempt.
You can also run a Report on Assessment and find the results for an attempt that way. To view documentation about how to run reports, click here.