Union apprenticeship sign-ups near San Diego

I heard of an apprenticeship with paid on-the-job training for people changing careers. I have read a lot of threads here and could not find my exact situation. Classes are in the evening and work is during the day. Did anyone go through it?

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

Bring your transcripts and any proof of work history. They asked for both in the interview.