I just posted this on another thread - keep in mind I am not in HS years yet, but this is what I think could work out with what I have. It might not be that way for you. Here it is:
I have heard Sonya say that to count Mods 1-3 as a high school credit for history, you would have to combine just the history part into one year. Which is totally doable, if you went through the guide books and did the history lessons for each module in 1 term. You can have them do one of the Bible studies available as a seperate subject in order to keep them doing Bible during that year. Another alternative she suggests is Beautiful Feet for going through the Ancients faster then the Mods go.
So I would seriously consider doing the history and geography parts of the SCM Mods 1-3 for 9th, with a seperate Bible study. Then for 10th, I would use Mod 4 as my next thing, keeping in mind that you can always pick out just the history part if time is an issue. For instance, could you not do Mod 4 that way for about 4 months, add in a Government/Civics (constitution) class or State Class for the other half. Then for 11 and 12 I would do Module 5 and 6 each of those TOGETHER count as 1 World History Credit and 1 American History Credit, finishing up with Government/Civics class as needed.
So hypothetically speaking you could do:
Ninth - Ancient cultures (Mod 1-3) (1 history credit)
Tenth - Module 4 and a State Study (each worth a 1/2 credit)
Eleventh - Module 5 and a Government/Constitution/Civics Class (I did this in HS, totally doable) 1/2 credit in each: world, US, and 1 credit in Governement)
Twelth - Module 6 - 1/2 credit in World and American
You end up with 4 history credits. The advantage in adding in the Government class in 11th is that you are freeing up an extra place in 12th grade to finish a needed math or science. ( I hope I did the math right, lol - I'm still waking up)