To access Word Preview please tap on the up arrow in the bottom left corner after a word is introduced. This will give you information about the topic you are learning, the level of difficulty of the topic, the percentage of how much you have mastered the topic, you will also see multiple words or sentences about this topic that you can add as a favorite, flag or hide.
Word Collection is a place where you will find all the words you learned so far. To access Word Collection and review all the words you have learned, please log into your account and tap on the Explore tab and, under Review & Progress you should find Word Collection.
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