Best calculus book or website for a 15-year-old

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Thanks for replies to my thread, I really appreciated it, although the books were a bit 'over my head' for me at that age :)

I'm now in university and getting along well.
I got help from the book Calculus The Easy Way to get a grip of what it's like.
For serious studying, I studied calculus at high school, and also by studying for physics olympiad.
Thanks for your concern!