If you’re already familiar with trigonometric functions (generally the last core topic of precalculus in the US), then you should be fine starting calculus. You will need to arrange a spot to take the exam, which will require reaching out to your school’s AP coordinator.
If you would like to learn trigonometry: https://youtube.com/playlist?list=PLuVp5PfVnO87xz4U5hYgaz75jhxVHWtxC
Khan Academy (take the precalculus course challenge to get credit for what you know, and then fill in any remaining gaps)
https://youtu.be/wVpaP6IyyvY
3Blue1Brown - The Essence of Calculus
https://youtu.be/MO-AExWdl4Q?si=mwObsg7ZxvYoEGqP
Khan Academy
https://apcentral.collegeboard.org/media/pdf/ap-calculus-ab-and-bc-course-and-exam-description.pdf (when using a source that is not aligned to the AP curriculum, like Paul’s Online Math notes, make sure you’re aware what is and isn’t covered on the AP calculus BC exam)
Calculus I
Calculus II
TI-83/84 Plus BASIC Math Programs (Calculus) - ticalc.org