There is no set "Japanese" way of teaching kindergarten kids, nor is there a "set" method of assessment. It will depend on the school. What one kindergarten does in Japan may just aswell be similar to what another kindergarten does in Taiwan or another country.
If you need teaching strategies for kindergarten classes, then check the
http://www.aacircle.com.au/forums/teacher-training/ where you will find lesson plans for children and toddlers.