No. You have to start on November 25th, just like everyone else.

Apologies for the average joke this early in the answer, but hey this answer is screaming out for a Yes like a 5-year old asking her mother permission to eat chocolate that I want to start with a No.

Of course, you can crack CAT by preparing from August onwards. Hell, even September 15th is not too late to begin. You need to scramble 400 hours from somewhere and prepare feverishly in those 400.

Chuck this desire to hear some stranger in the internet with absolutely no stake in your life and with absolutely no information about you to give you some form of Yes.

Instead,

Best wishes for CAT preparation. Get out of Quora, Facebook etc for 4 months - there I found your 400 hours. Cheers!