Hii,

If you want to prepare for CAT then you need to learn to divide your time properly. It requires roughly around 300-500 hours of serious preparation. You can achieve this easily if you study for 2 hours every day but it would be much better if you do it for 2-4 hours. You should devote 5-6 months to study and consistently practice for the test.  With proper time management and hard work you'll be able to crack this exam.

Hope this helps.

All the best!!