You can get to the vocabulary center either by selecting vocabulary in Browse videos, or by selecting “Ready to Study” on the progress ribbon.
The Ready to Study word list has been selected to optimize your language learning progress. You can also use the My Words vocabulary tool to study words in a particular vocabulary list or to see the words you have in progress or mastered.
To make best use of the My Words vocabulary tool, select Ready To Study, then remove any words you already know. Those words you mark as known will be stored in the removed list. Finally start the quiz - it’s that easy.