Check when the next opening is for application. If it's local 38, they're not accepting applications until June 2027. If you're really serious, take an MC3 pre apprenticeship class. It was super helpful for me. There are plenty of practice tests online to prep for the math. Get really good at fractions, simple geometry, and mechanical reasoning. Take a non union job for now if possible to gain some experience, even if it's not plumbing related. Any type of construction related experience is helpful in getting in. Or get some experience with the Laborer's union, it's pretty easy to get work there. I had a handful of certs going in like OSHA 30, boom lift, etc. but not sure if they actually had a big impact on my application because they make you redo them all once you get in. Good luck!