how to prepare and maintain a time table for cat exam with just four months left and I am working.

prepare on basics in Aug
revise in sep
start mock in Oct
get fired up in Nov

Make use of your available time as much as possible.Time table is a little difficult to be maintained at this point of time. It is better you try to complete first with the basics and keep giving mocks for sure as they are the key to crack CAT. After basics, practice and practice as much as possible.