Hi,

I hope you are doing well.

The ideal time for CAT preparation is starting from 6 months prior to the examination, some students who have a strong base and are confident in their respective subjects start their preparation from 3 months as well too.

Below I’ll be sharing a link which will provide a very good well detailed information on how and when to prepare for the CAT examination.!

https://bschool.careers360.com/articles/cat-when-and-how-start-preparations

I hope the above information helps.
All the very best.