CAT Preparation

First of all, take a mock. No matter how poorly you perform in it at-least you will get to know where you stand before starting your preparation, which are the areas you need to focus on. There are 3 sections in CAT VA-RC, DI-LR and quants.
VA-RC: The only way to score well in this section is to read various topics. It does not test your vocabulary but your understanding of the written text. You must be able to read and understand anything and everything. Please avoid comfortable topics. You can start with editorials of any newspaper.
DI-LR: There is no other way but practice. Practice and practice and don't lose your cool of head if you are unable to understand the set. Don't stop, just proceed.
Quants- Clear your concepts because questions are comparatively easy. You can try Dinesh Miglani Tutorials, it is very helpful.

Hello,
Ideal start would be to spend around 2 to 3 hours a day working on the basics of all the three sections. The best thing that you can do is create a timetable and allocate equal time to all the 3 sections. Most of the time, some students make a crucial mistake of only studying their favorite sections, I know this is a tempting option but eventually will lead you to mess-up the sections that you are not good with. As far as timing is concerned, you can dedicate 34 hours per day in weekdays and in weekends 10 hours to 12 hours. You can divide timings like12 hours before you leave for college you can practice topics like Arithmetic, Numbers, Geometry. And probably late in the evening once you are back you go for verbal. But whichever is your stronger area go for it first. You can practice RC, DI-LR for 2 days in the weekends till 2 months before CAT. Post that important topics should be in your daily to do list. Hope this helps. Good luck.