Union electricians are not looked down upon. Local 6 Electricians in San Francisco makes more the the average Programmer. They are making over $100/hr. as I write this. They will be working when the boom busts too. At least, book 1 electricians.
That said, it's not easy to get into. The well paying unions are all hard to get into. It's not the test, it's getting all the answers right, and then an oral accounts for 1/2 of the acceptance procedure.
To the original poster. Don't give up on you son. I had a terrible time learning, but it cleared up. It cleared up for myself in grade school. I had some kind of learning disability, but the experts didn't have a clue. I was painful shy, and honestly just wanted to be outside. I also studdered terribly.
Anyways it all just cleared up. I got cocky in eight grade because getting A's, and B's became easy. I hated high school, but loved college.
It was my last year of high school that I realized I was a Very visual learner.
Your son might be too? I remember having a terrible time remembering the multiplication table, and honestly think it's a waste of time.
In my last year of high school, I changed up the way I took notes in class. I would take one set of neat notes. I couldn't get every syllable the instructor spewed out, but I got enough. I would take all my notes on plain paper--no lines. Every page of notes had a picture/doodle incorporated into my notes. I would never recopy. I would go home and look at those notes before bed. I would touch up my doodles in my notes. At test time, I could visualize many of those pages. (And no--I do not have a idetic memory.)
I did had to repeat math courses at a community college. I needed to take basic math. Within a year, I finished Trig with an easy A.
I finished a four year college, and did pretty well. I spent a year in graduate school, and did well too. I was about to go to med school, but had a terrible nervous breakdown. Now that affected by life to this day. Looking back, I don't know what caused the breakdown, other than trying to be perfect, and being in my twenties.
My point is run the visual learning techniques by your son. I think someone must have written a book on what worked for myself?