I know I'm answering a few months after the fact, but I would definitely take AP classes if you can. But only the ones that would help give you credit at whatever school you end up choosing. You should look at the classes required in the undergraduate Speech programs you're interested in. If those programs require a Statistics class, or an English class, etc, then try to take AP Statistics and AP English--because more than likely, your school will count your AP classes toward those credits in college, which means you now have two less classes you'll have to take. And definitely keep your grades up so you can get into the college you'd like.
And you want to work hard in college. It's harder than high school, but it's easy to be lazy. Don't let your grades slip in college, because to get a masters in Speech, a lot of programs now are looking not just at overall GPA but at the GPA of the classes you take specifically for your Speech degree. So you want to do extra well in those classes. Sounds like you're definitely on the way to being a successful student and future SLP! Good luck!