Took test again, getting different rates (5)
I believe the answer is:
resat
'took test again' is the definition.
'different rates' is the wordplay.
'different' is an anagram indicator.
'rates' anagrammed gives 'RESAT'.
'getting' acts as a link.
(Other definitions for resat that I've seen before include "did test again" , "Took (exam) again" , "was tested again" , "Tried to pass again" , "went back to the paper" .)