Apprenticeship openings for electricians and welders - any advice?

I heard of an apprenticeship with paid on-the-job training for people changing careers. I have been trying to stay organised about it. Applications close in 14 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.

Thanks for writing this out. I went through something close to it 10 months ago, and it settled down once I kept a simple log of every call and form.