physics c next year (both of them)

Hi, im an rising junior and i want to take ap physics c next year (both of them because my school makes you take both if you want to do physics c) and i was wondering how bad it really is like it terms of both math and complexity of concepts because people say the course is very hard and i dont want to take it unprepared. For reference, so far i have taken ap chem and ap world (chem was easy, probably due to a good teacher)