Apprenticeship openings for electricians and welders

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. How hard is the test?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.

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