Exams can only be started if you have valid Exam Access. If this expires, you won't be able to take the exam and become certified.
If you've failed your first BTL1 exam attempt, you're able to use your free second exam voucher if at least 10 days have passed since your last failed attempt.
If you've used both exam attempts and haven't been able to pass, in some situations we permit students to purchase a third attempt for £100. Please review this help article.
If you've already passed and become certified, you are not permitted to take the exam.