Don't worry — you have up to three exam attempts without needing to re-enroll. After each attempt, the exam is automatically graded and you'll receive your results immediately.
If you don't pass within three attempts, or if your Certification Program access expires before you complete the exam, you can re-enroll for $100. Re-enrollment gives you one additional year of access and three new exam attempts. To re-enroll, log in to your account and use the Re-Enroll button in your E-Learning Center.