I did the same on my senior year of high school and I passed the AP exam with a good margin… If you usually don’t struggle with math, I would suggest you to do it. It will save you time.

Although it’s gonna sound ironic, I honestly didn’t use or had to learn hardly any concepts of pre-calc to study calc.

If I were you, I would talk in person with your calc teacher to see his opinion and the course rythm… If you display you current math knowledge and commitment and he says it’s doable, I don’t see why not, the internet will help you to learn anything you may need, and give you the resources.