Union apprenticeship sign-ups near Birmingham (update)

The training centre near Birmingham opened applications for apprenticeships in electrical and welding trades. 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.

Bring your transcripts and any proof of work history. They asked for both in the interview.