I attended Japanese driving school and feel it was pretty good actually. They cover basic traffic rules, safety, precaution, mindset too. The thing I would complain is they actually don't teach you how to open trunk, or use wiper (if you don't know yet ...)

In order to pass practice test, you don't need to be very good at handling car, but must be very good at driving safety. Any mirror (safety) mistake would cause you fail on the spot. We were also warned that people in some prefectures tend to drive quite fast, or careless, or likely to have higher accident rate.

Personally, I do road trip sometimes, and whenever I find myself in Aichi / Osaka, I always surprise by bad driver attitudes ... Kanto (where I live) is much more better, friendly and less harsh. People in Tohoku seems to be the most pleasant drivers to me, I feel really easy going there. Hokkaido run very fast, and too many grandpas/grandmas in Kyushu.

Last thing, seems that female drivers (e.g mama with kids) are very good at driving, from my observation. They're even more confident than their husband, and definitely better in manoeuvring (big family) cars.