Different schools cover different amount in their AP curriculum, and different universities cover different things in their intro chem (calc is a bit more consistent). Your best bet is to compare your high school’s and college’s syllabi and use your own judgement as to how well you know the material that the intro classes cover. Even if two people took the same AP course, their comfort with the material and preparedness for the next level can vary. I ended up deciding to use all my AP credit (including a full year of chem credit) and had no problem, but I know others who regretted making that choice.