Whether it is on a curriculum, course, or lecture view—a green progress bar will show you how far you are in a particular course or lecture. Furthermore, a progress percentage is also shown on the right side of your screen.
This is how it looks like on course level (example Anatomy):
And this is how it looks on lecture level (example Head and Neck Anatomy):
Likewise, you can also track your performance in the quiz questions the same way. Here, the red bar indicates questions answered wrong, the green one indicates correct answers:
The exact same approach is also used with regard to our textbook articles: