If you did not pass your exam, you can book another exam to do your retake. You are allowed to retake the exam the same day, if possible.
EXIN advises candidates to take time for extra study. Your coaching report will show you which topics need extra attention.
If an EXIN-partner provided you with a booking or a voucher, you can contact them to inform about resit opportunities.
For EPI courses, please contact an EPI office or EPI partner where you signed up for the course. A full list is available at: https://www.epi-ap.com/partner-datacentretraining.