Union apprenticeship sign-ups near Dallas - any advice?

I heard of an apprenticeship with paid on-the-job training for people changing careers. I do not usually post, so bear with me. The application needs a diploma or equivalent, a driver's licence and a short aptitude test. How hard is the test?

Keep everything in writing and save the confirmation numbers. It saved me later.

The aptitude test was mostly maths and reading a diagram. Free practice tests online were enough for me.