Trades apprenticeship applications open in Wichita - any advice?

The training centre near Wichita opened applications for apprenticeships in electrical and welding trades. It has been weighing on me all week. 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.

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