I feel your pain. The South Walton High School test scores are not where many parents would like to see them, the science scores in particular. (But we did get a 90 in writing this year!) There are some very involved parents at the school and it seems more each year. Although change doesn't happen as fast as we'd like, in the one year I've had a student at the school, I've seen some progress. One major area is that starting next year South Walton will no longer be on a block schedule. (Arnold is also on block schedule.) Although some disagree, I think this change will be very advantageous to our students. I think it will get a bit better every year.
One of the things we've been impressed with regarding education in this area is the many options you have. If you do the research, you can get a good education at SWHS. You have to know which classes and teachers are the best. If your child does well academically, you might want to consider dual enrollment where they can take classes at NWFSC in Niceville. There will soon be a small campus opening very close to SWHS. There is also Florida Virtual school, where you can augment your classes or take all your classes on-line. Also in Niceville, on the NWFSC campus, there is the Collegiate High School. They do have FCAT scores in the 90s, but for the most part, you have to pass a test to get in, so you're not really comparing apples to apples. It's a hike to get there especially if you're on the east end of 30A. The program there is for kids that are academically motivated. Niceville High School is also an option. It's certainly not very convenient, but their scores are in the high 80s for math and writing. Niceville is a much bigger school, so it can offer more classes than SWHS does and has some very rigorous AP classes. A big school isn't for us, so that wasn't an option that we explored very much.
The Walton county school system is evolving from a rural school system to one that prepares kids for college. From what we've seen here in South Walton, the expectations of the college educated parents that have moved here are much higher than they have been in the past. The same is probably true in the rest of the county as well. So as more parents get involved and push for more challenging classes and better test scores, the curriculum and quality of instruction will improve. I think we'll see more AP classes across the county and better instruction of those classes. At least, that's my hope.