Apprenticeship openings for electricians and welders - first time posting

I heard of an apprenticeship with paid on-the-job training for people changing careers. This is my first time dealing with any of this. Applications close in 19 weeks. What do you wish you had known?

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.