Honestly, just wiki.
I don't think a head-start is necessary for those classes.
I took AP Calculus BC last year (jumped in in "middle" of the year) was surprised by how much I knew. All I learned was little bits of stuff on my own, much of which I didn't understand at the time, and I had to take a minute and be reminded how to do derivatives.
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More after dinner xD
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I was familiar with concepts. I knew the basics of derivatives, integrals, reimann sums, and some names and theories.
I mostly just pursued calculus in my spare time so I could understand more about orbital mechanics, and I had thought I totally failed. I didn't know I picked up much more than I would need. You don't even begin to use integrals until the second semester of BC.
I would have taken Physics C if my school didn't enjoy inhibiting my education. But I know the class very well. Physics C really uses like 0.1% of what you'll learn in calculus.
So if you're concerned about being prepared, don't worry. With a reasonable aptitude for math and science and/or determination, you'll do just fine starting from scratch. And, by the way, you will probably not use anything you learned from "pre-cal". :lol: (maybe never again!)