Union apprenticeship sign-ups near San Diego - 9 months and counting

I heard of an apprenticeship with paid on-the-job training for people changing careers. I am in San Diego, in case local advice matters. Applications close in 21 weeks. How hard is the test?

You earn while you learn, but the first year is tight. Plan your budget carefully.

Visit the training centre in person if you can. Seeing the classrooms helped me decide.