Every college is so different if they take the credit or not and whether it meets any of the college’s requirements or not. My D opted to skip taking 2 AP exams because it did nothing for her at the college where she was accepted. The college did not care at all and my daughter did not ask for permission from them. Unless your son is going to a very highly selective school I dont think it matters. It took some stress off my D senior year and she was happy about it. No regrets.