Cool!
Go through your usual warm up routine and be ready a couple minutes before the set is scheduled.
Set up shop on or near the dock, but be considerate to leave enough space for other skiers and their gear.
If you need soap to get into your bindings, bring a small container even though it’s mostly provided by the school.
Bring your own rope and handle (or at least the handle)!
Be on the dock, gloves and vest on and ski/boots ready.
If you use a hardshell, have it on your foot!
Hand over the rope/handle and let the coach/driver know about your preferred ZO settings, starting speed, and line length.
Follow the coaches advice of how to start the set. Most schools start from the dock, some take their students in the boat and idle to the drop zone.
If you bring company, ask the coach if he’s ok with them riding in the boat.
(Most the times there need to be weights shifted around the boat if a passenger is present.) Ask if it’s ok to take pics/videos while in the boat.
After your set, most of the coaches will have a quick follow up talk with you. Listen!!!
Don’t rush out, but also don’t stick around the coach too long and hold up the routine.
You’ll figure it out.
Most importantly - Bring a positive attitude and have fun!!!
*edit
One thing I forgot - after you’re done, get your stuff out of the way!
Nothing more annoying than getting ready for a set and having to step around the dock, avoiding piles of wet gear cluttered everywhere.
Also - Check the Spraymakers podcast for the episode “How to get the most out of your coaching” or something along the lines - Lots of insights there!