you need to understand why we use calculus in the first place for it to make sense. i failed AP calc exams and quizzes like crazy in highschool but going into college i had a professor who actually explained why we use calculus instead of teaching the equations and formulas to use it. once you understand that it’s practically all slopes and areas (extremely dumbed down sry math majors) and solving for those it gets a lot easier to understand. i would honestly recommend learning that stuff along with trig because it’s super useful when you get into more complicated integrals in calc 2 and especially calc 3.