How to prepare for cat to get 100 percentile?

Hi Aspirant,
Practice,practice and more practice.
100 percentile means you have to stay at the top and definitely you need to master every single aspect of the exam to be there.
Gather the materials which can be useful and solve a lot of questions.Be very strict with yourself and have strong determination.Appear for frequent mocks and analyse your performance very nicely.See where you lack and work hard to remove your weak points.
Having a goal very high is important as it helps you to stay very close to the top layer.
The questions which come aren't very tough,you need to understand every bit of everything and have proper knowledge as to solve the questions in an easy way.
Hope this helps.