Chana, there are quite a few different organizations that offer online accredited high school courses - the first thing I'd do is to check your school district's policy for accepting courses for credit and placement (this should be in writing in your district's policy handbook), and the second thing I'd do is check with your local homeschoolers to see which organizations other families have used and which they have had good success with in getting credit (if it's allowed). Then I'd post here again with the specific organizations and see what feedback you get.
Best wishes,
polarbear
