I believe it takes around 6 months to a year to clear all 14 JAA ATPL exams
You believe wrong, my friend.
With hard work and dedication, they can comfortably be passed in 4 months, by a PPL qualified pilot (ie no commercial experience or theory / exams from other authorities.)
Someone who is already qualified CPL/IR and with commercial experience should be able to pass them more quickly.
So, back to the original question:-
I was wondering if anyone can advise me how to finish the exams quickly.
Answer:- study hard and be dedicated to the task!