Mock exam results (not the best) needing lift (6)
I believe the answer is:
deride
'mock exam results' is the definition.
'deride' can be an answer for 'mock' (deriding is a kind of mocking). I'm not sure about the 'exam results' bit.
'not the best needing lift' is the wordplay.
'not the best' becomes 'de' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'needing' is a charade indicator (letters next to each other).
'lift' becomes 'ride' (I've seen this in another clue).
'de'+'ride'='DERIDE'
Can you help me to learn more?
(Other definitions for deride that I've seen before include "Mock, scorn" , "Laugh at or make fun of" , "Jeer, belittle" , "Knock" , "Express contempt for" .)