There is no age restriction on taking the ACT or SAT. For the SAT (and perhaps ACT), you must use paper registration if you are under 13. You would need to bring some form of ID with you, or some sort of waiver due to age (to exempt you from ID). A passport would work just fine, or a school ID, if the kid has that. Kids do not need to go through a talent search.

Why did it spam the word p-a-s-s-p-o-r-t?