Trades apprenticeship applications open in Salt Lake City - 11 weeks in

I heard of an apprenticeship with paid on-the-job training for people changing careers. There are 10 people counting on me, so I am trying to be careful. 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.