We are in NoVA and the tutor is through Educational Connections. They may have tutors in DC, I don't know. But I don't know what we would do without her. They used to work on organization and planning, but DD seems to be getting the hang of that. This year they have focused almost exclusively on test taking skills and strategies.
They go over all of her tests and talk about why she made the mistakes she did, what can she learn from that, and what she should do differently next time. They also talk about what study strategies helped or did not help.
My DD does not really need help with the content, so that is a different issue. We did finally realize that her math teacher was horrible, and now she just goes to Khan Academy. It makes me angry that she has to spend 3-4 hours a week on Khan Academy to learn what the teacher should be teaching, but I guess it is what it is.