I felt so bad for having a low level of retention for some time. But based on the poll in this post you are not alone. Is really 90+% the norm? 2/3 often have low scores. Yes, you and I are both not going to be able to complete a level in 7 days and remember the vocab and kanji, but is it even necessary. We are trying to learn, and you are more often correct than wrong, you are making progress. Don’t forget that!
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