You do not forget words because you are lazy. You forget them because you met them once, in a list, in an order that had nothing to do with how memory works.
Rate how well you knew a word and it comes back exactly when it is about to slip. Tomorrow if you nearly had it. Next month if you knew it cold.
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All of them, not most. The GRE rarely tests a word's first dictionary meaning, it tests which sense is in play from the sentence around it.
In the drill the word is blanked out of its own sentence and you pick the meaning that fits the gap, rather than reciting a definition.
Two students on the same word are at different stages. The words you already know cost you nothing, which is the whole point.
The word list itself stays browsable and searchable whether or not you have a live period. What a period buys is the scheduling.
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