AP Exam registration is closing today. Make sure you have declared your status on Collegeboard and you have payed through the payment portal, which can be found on the John Champe website. When paying, you do not need to specify what exam you are taking, just put the quantity of AP Exams you are taking. If you pay now, you will only pay $85, however, if you pay late you will hav to pay $125 for each exam you are taking.