Crossword Genius

Right on 75% of exam - extremely confident! (5)

Ross

I believe the answer is:

exact

I'm a little stuck... Click here to teach me more about this clue!

'right on' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for exact that I've seen before include "correct in every detail" , "19 [WREST]" , "on the money" , "Faithful" , "Demand payment" .)

I've seen this clue in the Sydney Morning Herald.
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