There is a computer curriculum called *Switched on Schoolhouse* by Alpha-Omega Publishers that a co-worker of my husbands used with a great deal of success. She had a troubled teen who the PUBLIC school wouldn't take any more. He was headed for JD. She had no alternative but homeschooling and used that program and they loved it. You can get the major subjects, English, Math, Science, and Social Studies. There's a five curriculum pack that also includes a Bible Study.
If the student is a teen and is really motivated, they can do an awful lot by themselves. This is not an unheard of situation and these kids are often highly motivated and will do the work on their own. That's really the key. If a kid doesn't want to learn, you just can't force it into him.That was the situation with the family above. She's a single parent who worked full time and he stayed home and did his school work. It's very reasonably priced per subject. Much of the curriculum is over-priced IMO. Here is a link to a curriculum provider that has excellent prices on material.
http://www.rocksolidinc.com/
The curriculum they sell has a distinct Christian perspective, which includes Alpha-Omega.
For math, however, I would not ever use anything other that Saxon Math. I learned a lot from it and is very self-explanatory. The lessons are explained clearly to the point that my kids really taught themsemves by the time they got to jr. high. They would ask my help when they came to something they didn't understand but other than that, they pretty much did it on their own, even as far as the calculus.
I'm sure that hardly covers it but don't hesitate to ask more.