@Antonella_Dimasi Hello! Thanks for reaching out.
-the purchase of the voucher has an expiry date? Once you purchase the exam, it does not expire and you do not need to schedule until you are ready.
- if I can take the exam at any time or do I need to reserve the date? We recommend reserving a date. But yes, you are able to take the exam on-demand IF there is availability at that time.
- what is the minimum passing percentage? When you complete your exam you will receive as pass or fail result along with a report of how well you did in each of the exam topic areas (represented in percentages). We do not share a breakdown at the question level to keep our exam content secure. To see the exam topics and objectives and to learn how to prepare please reference our exam guides:
Associate Developer Exam Guide
Associate DBA Exam Guide
Please reach out to certification@mongodb.com with any further questions.
Thank you!