To say

Your statistics shows you how well you know the words and kanji in this study list. This is determined by how well you perform on the drills for each word and kanji. Here's how we grade you for each word or kanji in this list.

Perfect

You've successfully answered correctly all drills related to this word or kanji.

Okay

You've answered 1 or more drills correctly related to this word or kanji. However, you still have a few drills unanswered or incorrect.

Poor

You have either not answered any of the drills related to this word or kanji or they were all incorrect (keep trying!).

Unknown

You have not yet added this word or kanji to your drills, so we don't know if you'll know it or not.