Subject change on test day

Hi,
I am currently waitlisted for tomorrows SAT subject tests. I would like to change from Math 1 to literature on the test day, since I know you can do that. However, the Collegeboard page says that you must test exactly what is on your admission ticket. Does that reffer to the subject? Or is that for other type of changes? Such as number of tests, removing the essay from the normal SAT, etc.

Bottom line, I need to know if i can change the subject on test day being waitlisted.
Thanks

As far as I know, you can change the subject when you’re in the testing room. I’ve never done that myself but the directions and such imply it, since you don’t have to do tests in any order and you can add subjects on the day. I’m guessing that the “other type of changes” are the type of test you take, like how you cannot register for subjects and then decide that you want to take the regular SAT instead.