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I would go for it, you can always drop it. And whether or not you'll have to repeat it depends on where you go to college. Many people in my multivariable class now (at Duke) took it in high school, and it is nothing like it, ie. much harder.
I also know people who took BC at some point and took a break from math, so my opinion is to try, you can always enroll in stats or something easy at your high school.
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