If you are competing in USPSA matches, you should consider becoming a member of
USPSA. Only USPSA members can be classified.
You can join for as little as $25/year:
https://www.uspsa.org/uspsa-join-renew.php
This page describes the USPSA classification system:
https://www.uspsa.com/uspsa-faq-details.php?How-does-the-classification-system-work-9