Great Quizing!
My experience has been very positive with this program and the quizes are particularly challenging, starting off with easy questions and then as you progress, challenging you to read kana and kanji in the question, as well as in the answer. This really points out the areas you need further study in. You can also change the level of quiz for each section you are studying. For example you may be at level 3 on Vocabulary but on level 4 on Reading so you can quiz and drill yourself at those different levels with changing the settings. The Reading section is also very well done and totally challenging, ending complacency.
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KanjiBox