DUI has me waiting on MMC. What to learn in the mean time

So I’m looking at anything from one to three years of assessment before I can get my MMC PROCESSED. I would like to attend Seattle Maritime Academy for there engineering program. Seems I’ve some time to kill. There are a few 16-24 month vocational programs in the area. What would be most applicable aboard a ship? Thinking HVAC or some Electronics. There’s a marine carpentry program that would be a lot of fun, but I don’t see how building a wood hulled sailboat is gonna help me in engineering. Any and all suggestions welcome. And thanks in advance!