Hi Naveen,

Percentile is used to divide the population into groups i.e. if you have got 90 percentile then your score is better than 90% of the candidates. Since it based on the population so you could expect fluctuation in your rank when you compute it for Jan session compared to that of April session as number of candidates increase for the latter. That is why the qualifying cutoff for JEE advance is released after april. Since you had not mentioned the branch I'll be providing it for all:

• Civil:9243
• CSE:3444
• ECE:5465
• ME:7251
• EEE:6432

For more information please refer this link:

https://engineering.careers360.com/articles/jee-main-cutoff-for-nit-goa