Apprenticeship openings for electricians and welders after 15 years as a project coordinator

The training centre near Seattle opened applications for apprenticeships in electrical and welding trades. I worked as a project coordinator before this. The application needs a diploma or equivalent, a driver's licence and a short aptitude test. 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.