AP Scores Come Out After Incept

I signed up for Incept on June 3rd, which from my understanding is when we sign up for classes. However, I’m taking 3 AP tests this year and the scores don’t come out until July, which determines which core classes I’ll be exempt from. Do I have to sign up for classes at Incept, or can I wait until my AP scores come out in July so I don’t sign up for a class I don’t need or not sign up for a class that I do need because I didn’t pass the exam?