As a student you can choose to focus on a particular list. This means that only words from this list will be tested and used in the activities.
In order to focus on a particular list:
Click on 'Words' on the top bar
All of the lists that are available for you to study will appear on the left hand side of the screen, click on the one you wish to focus on
A button reading 'Focus on this list' will be on the top right hand side of the list - click it
If you choose to stay focused on a list after you have learnt most or all of the words on that list then you will stop earning as many points.