Grammar Review, but says "Study Grammar", how much?

Hi, I’m new. Study a couple of grammar points and then selected “Review”. System said I need to study more grammar. How much study before I can review?
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Use the Study button to study grammar points and then take a quiz at the end. After passing the quiz, those points are added to your review items.
Or, when looking at a single grammar point, there’s a button at the bottom “Add to Reviews”. That puts it immediately into your review items.

After that, each time you answer correctly, it waits longer until the next quiz, according to the intervals below:

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