Hii aspirant..

Coming to your question if you really want to get admission in top 10 B Schools and I would suggest you to go for fully dedicated CAT Exam preparation. With not so good academic the possibility of getting into IIM or any famous B school is just your cat score. If you score above on around 99 percentile then there are chances. And if you belongs from reserved category then yes a score above 9897 percentile will surely work out for you.

If you are reserved, non general non engineer candidate then yes it is surely going to help you and if you performed well in your CAT exam then and there high chances of admission.

So just don't lose your hope and work hard for you CAT exam as it is only going to decide the college.

Hope it helps. 

Best of luck.