Union apprenticeship sign-ups near Portland

I heard of an apprenticeship with paid on-the-job training for people changing careers. The application needs a diploma or equivalent, a driver's licence and a short aptitude test. How hard is the test?

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 13 months ago, and it got easier once I kept a simple log of every call and form.