I don't think 50% should be a passing score. We're talking life or death here. I'll have to ask my son when he gets home, but I believe high 60% is passing for middle school, so certainly gun skills should be even higher than social studies. 100% might be high, too, but again it's literally life or death, especially when you're talking about people carrying to protect themselves in public places or to take out the bad guy.
In WI, they proposed significant training, but if I'm remembering correctly it became completely optional. I'm seriously uncomfortable with that.
I'm also not comfortable with people's ability to accurately assess a situation. Let's say we have that CO movie incident, and someone from the lobby comes into the theater. Who IS the bad guy, if there are 4 people all shooting?