Invoices must be paid right away; they expire three months from issue. Students have six months from invoice to take or schedule the exam. The exam can be rescheduled anytime online up to 72 hours before the start of the test. Cancellation or rescheduling within 72 hours of the computer-based test results in a $100 fee. Once payment has been processed, study materials can be found in the student’s “my purchases” section at myiapp.org.