Yes, you have 1 year from the purchase date to attempt your exam before it expires. If you have a Standard or Professional Training subscription, your exam attempt(s) will expire at the same time as your subscription.
Please note you must enroll, schedule, and take any certification exam prior to the end date of your subscription. If you need to retake the exam you must wait at least 14 days from your previous exam date in order to reschedule your next attempt.