<p>The purpose of taking an AP class should not just be earning college credit. A lot of people take them even after knowing that the college they will attend will not award credit. The main purpose of taking AP classes is to prepare yourseld for college by taking challenging courses and to show colleges that you are capable of doing well in college level courses. The way I see it, the credit is the just the cherry on top. But, to answer your question, it depends on what school you are going to. Some schools allow to skip the class that corresponds to the AP one you took while others just award elective credits.</p>