As a student you can choose to 'star' words from the lists. You can do this by:
Click on the 'Words' tab on the top bar
A list of the words from your lists will appear, and you can click the dark coloured star on the far right of the word
When you have clicked on the star then it will then become gold coloured
By starring a word, it will then be added to the your Starred list. You can then choose to focus on this list, so this effectively allows students to create their own lists and focus on that specific list.