Hi aspirant,

Your cat examination percentile cannot be calculated just from your performance or marks you have obtained in the examination this is because it depends upon the performance of other candidate also. Actually percentile is the measure of percentage of people who have scored lower marks then you and the entrance examination and cannot be calculated until and unless you have scores of each and every candidate. However if you want to get idea about how it is calculated and the previous year trends you can visit the link given below

https://bschool.careers360.com/articles/cat-score-vs-percentile

Hope it helps!