help w calc

my math calc is lowkey cooked. i switched teachers during functions and lcd, so my functions is half done, limits good, continuity and differentiability ZERO! and to kinda keep up w class i learnt integration(indefinite) and MOD myself through full lectures (these are at an okayish level- easy mains level). do i revise functions through question solving and then head onto continuity??? because my half baked functions knowledge didnt bother me during limits but im having a hard time in continuity