Check with the counselors at your nearby high schools and any college education programs, but I'd start with high school. Since you're looking more for a motivator and not a content tutor, someone with the right attitude and energy will be more of a help. I tutored a brain-injured little girl while I was in high school, and this was exactly the role her parents wanted me to play. She was very bright but just got frustrated, so I was the "external good attitude". They found me through the school counselor who recommended me to them. I wasn't looking for a job, but when they approached me, I agreed to meet with them and fell in love with their little girl.
What we did with our older son was pay for private school with an accelerated academic program. It wasn't ideal, but his birthday fell in late Aug. where he missed the cutoff. We started in public but moved him in first.
Good luck!
