Try the Seton Home Study program.
Second that. My daughter was very well prepared for college.
Regardless of the program that you choose, your child will more than likely improve academically.
The most important reasons to homeschool are religious and moral. Homeschooling parents have control over these aspects of their children's education.
____________________________________
Our decision to homeschool was one of the best that we have made as a family. We have no regrets whatsoever. And don't worry. It's not hard! Daily tutoring can take as little as one hour. The kids will work independently for a total of about 5-6 hours/day at this age. So there is plenty of time for other enjoyable group activities. Don't forget to enjoy their company. You can have a lot of fun.
Bless you for doing this for your family members!