Trades apprenticeship applications open in Baltimore - 6 weeks in

I heard of an apprenticeship with paid on-the-job training for people changing careers. It has been a long 6 weeks. Applications close in 6 weeks. What do you wish you had known?

Keep everything in writing and save the confirmation numbers. It saved me later.

The aptitude test was mostly maths and reading a diagram. Free practice tests online were enough for me.