Way to get exam success over time (7)
I believe the answer is:
passage
'way' is the definition.
(passage is a kind of way)
'exam success over time' is the wordplay.
'exam success' becomes 'pass' (I've seen this before).
'over' is a charade indicator (letters next to each other).
'time' becomes 'age' (age is a kind of time).
'pass'+'age'='PASSAGE'
'to get' is the link.
(Other definitions for passage that I've seen before include "Section of musical or literary work" , "Corridor or narrow laneway" , "Some reading" , "Way through something" , "Literary extract" .)