I am working professional if I study for 2 hrs a day on week days and 4hrs during weekends can I secure 99ile in CAT in 11months ??

Absolutely you can score more than 99 percentile in the CAT exam if you look at the syllabus then there are mainly three parts berbal logical reasoning and data interpretation and quantitative aptitude so you can understand that all the topics are something we use in our day to day life like quantitative aptitude if you are good at mathematics till class tenth then giving a little bit of time daily would be sufficient for quantitative similarly if you are good at English then verbal is just a piece of cake for you logical reasoning and data interpretation notes for practice show all the three parts are easy based on your previous educational background if we have sound understanding of your basics then would not be a stop job for you however if you need to revise all the basics then also to 2hours on weekdays and 4. hours during weekends is something which I guess sufficient for getting more than 99 percentile.