The maximum marks for JEE advanced is not fixed and this year JEE advanced is yet to be conducted.

therefore it cannot be predicted what would be your all India rank in JEE advanced if you get 85 marks.also the all India rank depends upon the relative performance sometime question paper comes very difficult and with less marks you will get better man thanks and sometimes you need more marks to get the same rank therefore it is very answer then so so don't go just by numbers.