In short test, four or six quiz questions perhaps (6)
I believe the answer is:
trivia
'six quiz questions perhaps' is the definition.
I can't judge whether this definition defines the answer.
'in short test four' is the wordplay.
'in' is an insertion indicator.
'short' means to remove the last letter.
'test' becomes 'tax'.
'four' becomes 'rivi' (I can't justify this - if you can you should give a lot more credence to this answer).
'tax' with its last letter taken off is 'ta'.
'ta' placed around 'rivi' is 'TRIVIA'.
'or' is the link.
Can you help me to learn more?
(Other definitions for trivia that I've seen before include "Something of little importance" , "Non-essential data" , "The details of little or no importance" , "Minutiae" , "minor points of interest?" .)