Congratulations BLUENATION!
The tone of your questions is far less accusatory than your initial post after the Kentucky loss. It is hoped that you have had some time to process the game and have come to realize that officials truly do not care who wins the game. Are we human? Yes. Do we make mistakes? Occasionally.
This is the mindset I have when I enter the gym:
"Sometimes wrong, never indecisive."
As for your questions....
What level of education is required to be a ref or to be considered?
As you would expect, the level of education is dependent on the level of competition.
Third Grade Pee Wee league
Hey you! Wanna be an official!?
Middle School
. Hey You! Can you count to Three seconds?; Do you know how to call Over-The-Back?
High School
. Hey You! Are you state-certified and have you completed the necessary clinics?
NCAA
. Hey You! Do you have any dates open on your calendar?
UAB Vs KY
Hey you! Wanna be an official!? (Can you take a Joke
?)
Give a percent on how many refs have another "primary" job?
All that I know officiate because they love to be in the gym. None can support themselves with officiating fees because the pay is not nearly enough, especially at the High School level.