This is only a thought but I for one would find it really handy if, after reviewing words in the study centre, a complete listing of all the words reviewed could be displayed (along with the final score). Especially as in my fog of ignorance I often get the pinyin right but then think "what the hell did that mean", or the meaning right and then wonder how to say the word. Of course, at the score stage, I have forgotten which words I could not remember so I am unable to follow up further!