Method of study? Drop core technical subjects (6)
I believe the answer is:
system
'method' is the definition.
(I know that system is a type of method)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for system that I've seen before include "Plan of action" , "Organised whole made up of related parts" , "Set of things working together" , "My sets (anag.)" , "Body of doctrine - method of procedure" .)