Teacher reports
To view a report of who has viewed your lessons, click Lessons, then Report:

This will show a list of everyone with access to your map, cross-referenced by who has watched your lessons.
The blue box represents the proportion of a lesson/quiz has been done:

When a lesson is fully watched and all questions have been answered, the box will be a solid colour.
View question answers#
To view what your students answered for a question, click Lessons, then the name of the lesson whose quiz you want to look at, then Results:
Select a user from the dropdown, and you'll be able to see what they responded for that question.