dear mam ,it takes how much time for the preparation of cat test?

Not less than one year under best & favourable study conditions, I think. But if you can develop the attitude required for the test then you can cut short the preparation time. Your postive efforts would decide how much preparation time you can cut short. Study with a proper plan, study objectively,

it require your labor for preparation. time required for this depends on communication skill and analytical skill. of course it will be sufficient before your one academic year. all the best

Dear Jagdeep, it depends upon your efficiency, you can take 1 year and you can finish it 1 month also. Generally 1 year is sufficient time.