Do you have to get credit for the AP Scores?

Rather than guessing placement based on how confident one is*, it would be better for the student to try the college’s old final exams for the course(s) that are allowed to be skipped. That will give real information about how well the student knows the material from the college’s point of view.

*Often, strong students are not that confident, while not-so-strong students are overconfident.