Port Authority NY NJ

Looking to get back into union work after leaving for the private sector, taking my written soon. I'm looking for SPECIFIC things to focus on to brush up on. I've asked in other subs and all I've gotten was "study everything". If any of you have taken the written or practical and remember even one thing I'd appreciate it, for example I had to identify something on a diagram, trade math etc. Please save everyone's time and don't comment unless you have something specific like "everything HVAC" thanks but that is not helpful