I can't personally vouch for how good they are, but there are plenty in the Wappinger area. I've come across people offering tutor services here, and I've even been one of those tutors long ago, but for that we're talking private tutors. Those definitely do exist.
Unless something has changed, there's also a Sylvan Learning Center on Route 9 in Wappinger by the Planet Fitness. At least it was there several years ago; honestly unsure if it's still there now.