Crossword Genius

Part of simple sum in school exam (6-4)

Ross

I believe the answer is:

eleven-plus

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'school exam' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for eleven-plus that I've seen is " School exam".)

I've seen this clue in The Times.
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