Really very nice, do use it. Helpful for students and for everyone who wants to improve their vocabulary.
WELL Good exposure!
Now you can practice just your favourite marked words.
if you want to add/update the words & their meanings and sentences in the wordlist then you do it immediately & very easily.
Now you can see your entire performance.
Go to the history option & then browse through the words that you have marked. :)
Also this is customizable. Go to the Settings to get to know more how you can do it!!