Smitty,
I broke into the trade back in the 49's in my fathers shop. In over 50 years in the trade yhe very best advice I cangive you is what I've already posted,
get a job as a helper and take it from there.
We don't have a strong union in my area soI can't advise about that.
But what I can advise about is plumbing and training helpers to get their license.
Reading over your first post;
I am considering applying to a plumbing apprenticeship. I was wondering if anyone had a link to a good plumbing apprenticeship entry level exam.
Do you really think that you can learn enough plumbing by reading a book or exam? WRONG!
There are things ou in the field that just aren't in any book. Just ask any of the experts on this page.
Before you even take the entry level plumbing exam you got to know basics.
Now comes the advice, ( and I'm not even charging).
When I was running big jobs I'd pick me out a ambitious helper as my personal helper. That way he was exposed to all phases of plumbing construction. Rough in tub set ,water pipe and stack out and after standing inspection with me, trim out.
My problems were his problems, (and I had plenty working 6 trucks of plumbers in a 7 year division complete with multiple sub divisions with a two phase shopping center) Some of my old helpers now have their own plimbing businesses and one is general manager of the largest shop in Sarasota. But they all started as helpers.
Get a job as a helper, buddy up with a good mechanic and learn. Then, if you still want to take the entry level plumbing exam go for it and you'll have work experience that you'll have what you can not get out of a book. PRACTICAL KNOWLEDGE.
I want to wish you well in your chosen trade. Please keep us imformed of your progress. Tom