Even a student who got 100 %ile cannot tell you how to score the same in CAT. If you work as hard as someone who got that score you may still end of getting 97-99 %ile only.
A lot of it depends on luck on the higher side of the spectrum. Personally, I find no difference in ability between a 99 %ile holder and a 100%ile holder. It all comes down to the smallest of details in the end which cannot be controlled by students.