Is Pre-Calculus to Cal BC normal in your school? Our school has a policy that if you take Pre Calc over the summer, you’re not allowed to skip AB, because summer courses typically don’t teach enough to be able to succeed in BC without AB. I’ve also heard that speeding through Pre-Calc isn’t a good idea in general, because it’s important to be really good at it for Calculus. Anyway, my point was that speeding to BC junior year might not be such a good idea either, because you’d be skipping two courses, including one important foundation course.
Also, I don’t know much about the IB courses, but I’ve heard that taking CSP helps in CSA and vice versa, and that Physics C is manageable if you’ve taken Physics before and Calc at least concurrently, so those might not be too bad (I haven’t yet taken those courses though, so it’s just what I’ve been told by upperclassmen.)