First attempt failures on the PTCB usually trace back to one thing: uneven preparation. Candidates often focus heavily on drug names and dosages while barely touching topics like federal requirements or insurance processing, and those gaps show up fast during the actual test.
Confidence can also work against people. Feeling ready after a few practice quizzes is not the same as being ready for the full range of questions the real exam throws at you.
One thing that genuinely helps is taking a full-length practice test before your actual exam so you know exactly where you stand. CertBoosters has resources that walk through this kind of preparation in more depth: https://www.certboosters.com/ptcb/path/ptc