GUE (Global Underwater Explorers,
Welcome | Global Underwater Explorers) fundies (short for fundamentals) is a gatekeeper skills course for GUE's technical courses (
GUE Fundamentals | Global Underwater Explorers). There are similar agencies in UTD and ISE. What I mean by gatekeeper is that prior to taking technical diving courses, one must meet the performance requirements of this skills foundation course.
Unfortunately, in most cases, c-cards are purchased rather than earned. Organizations like GUE, UTD, and ISE (and RAID) have clear, objective standards for what constitutes skills mastery. This is why I encourage divers to seek training in those organizations or instructors with that mindset (like me!
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I hope this answers your questions.