I have a SIDA training class coming up in a few weeks before I can start working at Newark Airport. The person who is scheduling the class says that I have to pass a test at the end of the class to receive a certificate. I heard that there is only a couple or a few questions but what would happen if I fail the test by chance? Do I have to reschedule the test at a later date? Or can I only take the test once and if I fail I cannot retake the test anymore?