Trades apprenticeship applications open in Memphis - first time posting

A local apprenticeship programme is taking applicants for the next intake. I do not usually post, so bear with me. 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.

Keep everything in writing and save the confirmation numbers. It saved me later.