BC Calc and Chem: Use an AP exemption or take the class?

At Berkeley L&S you won’t get credit for Calc 2 unless you get a 5 in BC (for Engineering you can get credit with a 4 or 5). For a 5 in the BC portion I would probably skip unless the AP class was from a long time ago, say 2 years ago; for a 4 I wouldn’t skip.