Union apprenticeship sign-ups near St. Louis - any advice?

A local apprenticeship programme is taking applicants for the next intake. I have read a lot of threads here and could not find my exact situation. Classes are in the evening and work is during the day. How hard is the test?

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

You earn while you learn, but the first year is tight. Plan your budget carefully.