Agreed; I've been doing pro bono SAT teaching in inner city schools since 2000, but nothing can replace one-on-one SAT tutoring, which I've never seen a grant for.
(I've since left Kaplan to work on Red Ivy Prep, my side project that aims to find repeatable TODOs based on learning styles. Thankfully, I have a sister getting a PhD in learning and memory research who's helping me out with the theory. I'm trying to do a free all-day drop-in workshop for students here in Boston on MLK day, but it's a lot harder without that credential anymore.)
I am having trouble locating SAT test prep centers in Raleigh, NC who provide free training (via Google). I will try to contact the school system directly this week.
I think that is mostly true for people who are younger and have less other experience. If you are trying to tutor in HS or College you will need exceptional scores. However, if you have graduated with a degree in Math, English, or Education you can likely parlay that into tutoring, certainly pro-bono, they can use all the qualified people who are willing to help