Let him know that CO. Has adapted the 2023 NEC and source it for testing.
Also he cannot take his own copy to the test, they will supply an un-tabbed and unmarked copy, and he can only take a basic calculator, no programmable or graphing ones allowed.
He won’t have the cheat advantage with one of their old just before a code cycle change marked & erased answer copy that people have done.on their test.