A module consists of some questions and could also contain video, interactive learning or other materials.
If it has a video, it could look something like this:
At the end of the video, click through to the questions page. It'll look something like this
Once you have finished the quiz, you will see the results page.
Tracking module progress
You can see which modules you have taken and what your last score was.
You can also see this progress in Your courses > Take training modules.
Note that each learner licence section and Fleet Driver Skills have their own road rules modules with slightly different questions, so you will see, for example, Behaviour, listed several times, once for each instance. Your progress will only be registered in the section that you took the module from.