What does the cryptic crossword clue "Exam — this one makes twelve (6-4)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Exam — this one makes twelve (6-4)

Guardian Cryptic #27757 | 6 Down | 2019-03-01 flower

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