How can i get 99 percentile in CAT

It depends on which stage of preparation you're in and what year are you going to appear. Considering 2022, you have a good chance if your basics are sorted. Just practice 30-40 varied questions for Quants that includes different concepts. It's those concepts that should strike like a bolt when you are appearing for the exam. Practice at least 6 LRDI sets of various types. And for VA go for sectionals almost everyday. Ofcourse, all this with Mocks. A command over any two at the strongest level and a substantially well 3rd section will fetch you 99.