Hello

It is difficult to predict the actual rank or JEE Advanced qualifying marks as for the first time JEE Main is being conducted twice and rank will be based on NTA percentile score but you may calculate your expected rank by this formula-

 

874469 are the number of candidates appeared for the January exam. So rank formula is (100- your total score) * 874469 / 100.
If the number of candidates for April exam increased to 1400000 then your final rank shall be (100- your total score) * 1400000/100

Good Luck!

Hello aspirant, percentile is a representation of your rank. Your rank is (total number of students -(percentile*0.01*number of students))

 Your rank is around 41688. With this you will be able to sit for jee advance and with a quota you can get a decent branch in a good NIT.