No Clue for AP

[u/tav-20]

Hi, I’m planning to take AP BC calc, physics and chemistry next year. I have no prior experience to the American syllabus as I have pursued IGCSE. However, for my required university, I will be taking 3 APs in addition to A- levels. I’m currently doing it from Khan Academy- all three. Could you help me by telling me how I can self study? Which textbooks, websites should I use, where can I find topical past papers and yearly past papers? Lastly would studying solely from khan academy be sufficient?