Any "adult learners" have to take the SAT?

I’ve got to take my state’s test for college scores (the ACT here) but most take the SAT.

Do any “adult learners” (i.e, people that have graduated from High School years ago..) have experience with taking these tests years later?
Most of the tests I’ve found are held at local High Schools.

I’m particularly anxious about taking a test with a lot of teenagers. Its a silly thing to be having anxiety about, but none the less…

Can I get any helpful tips for Adults that have taken these tests years after HS? Maybe even some tips about going to college and not being 18? ;)

(By the way, what did most of you major & minor in? I’m interested in majoring in psych. and minoring in French.
Did you find that your majors weren’t very useful?)