Union apprenticeship sign-ups near Cleveland

A local apprenticeship programme is taking applicants for the next intake. This is my first time dealing with any of this. Classes are in the evening and work is during the day. 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.

Visit the training centre in person if you can. Seeing the classrooms helped me decide.