What does the cryptic crossword clue "Best sources of general revision before each exam (8)" 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.

Best sources of general revision before each exam (8)

Guardian Cryptic #29884 | 4 Across | 2025-12-22 flower

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