With only about 20 exercises per test, what do you think?
I think there is not a way for doing that.
that is a good question but sadly no
Perhaps you are looking for the "Strengthen Skills" button under the chart showing the XPs you've earned for the week.
It doesn't bring all your skills up to full strength, though.
Unless the course developers for that course uses a lot of the vocabulary through the course, there is no way other than that.