How volleyball officials actually work a match — the mechanics and signal knowledge on certification exams and floor evaluations. First-referee and second-referee responsibilities and the division of the court; the pre-match routine; authorized signal sequences — whistle, then signal, then indicate the fault and the server; line-judge positioning and flag signals; managing substitutions and the libero replacement zone; rotation-fault responsibility; and match management — cards, conferences, and keeping tempo. Explanations walk the correct sequence, name the mechanical habit that gets officials marked down, and end with a rule you carry onto the stand. Original questions about published mechanics — never real exam items. Stamped to the NFHS/PAVO season. Independent practice, not affiliated with any officiating body.