Thinking outside the box - pre-calc is basically just an amalgam of trig functions, logarithms, exponents, etc. Assuming you covered everything in algebra II properly, you should be able to skip straight to calculus I, since calculus textbooks and calculus courses always cover the pre-calc ground at the start. No point doing it twice. Trig and pre-calc by themselves are pretty boring, because you don't get to see -why- you're studying all the material. Same reason why language arts seems pointless until you're studying a foreign language.
I went straight from algebra II to calculus I. I skipped over advanced math, trig, and pre-calc. Never did a formal geometry course either, for that matter. Given, I'm not personally familiar with how Abeka's textbooks are set up, and I'm fairly good with math, so take my advice for what it is
