6515 over 100: English exam? (4,4)
I believe the answer is:
viva voce
'exam?' is the definition.
(I know that viva voce is a type of test)
'6515 over 100 english' is the wordplay.
I cannot really see how this works, but
'over' could be 'o' (cricket abbreviation) and 'o' is present in the answer.
'100' could be 'c' (Roman numeral) and 'c' is found in the answer.
'english' could be 'e' (abbreviation) and 'e' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for viva voce that I've seen before include "Oral examination" , "Oral exam" .)