Have a plan to get back if you get injured during class.
I have had a severe ankle sprain, my plan was to drive a manual transmission truck 3 days home. I did it, it sucked. That was the easy one.
I dislocated a shoulder at another class, drove to the ER (did not have a cell phone with GPS on it at the time); had my GPS unit with me so that was fortunate. Doc's were going to keep me overnight because they were about to give me serious pain meds; told the Doc no thank you, I have to catch a flight, can you shove it back it, he did. I high tailed it back to class to pick up my gear, then back to the airport. Guy I know was in the class (again fortunate, realized were in the same class, but this was not planned), he had my gear and was going to ship it to himself.
Both times the training school took good care of me, but there is only so much they can do.
Both of these classes were more physical than most as it was force on force training.
All injuries were caused to myself by myself.
Also be ready for the weather that will be at your destination. I have found that I need to take all seasons of clothing, or buy some there if the weather changes.
EDIT: Also take 2 magazines you do not mind tossing to the ground. If you have malfunction clearances you may be stripping mags to the ground. These are artificially set up so you should have time to use beater mags.