If I get 98.5 and above percentile in fiitjee aits what rank can I expect in iitjee?
98.5% in FIITJEE Aits is good enough. You can expect a rank within 700 in IIT JEE, ie assuming you perform the same way as you do in your AITS. You should focus on maximising your performance to your full potential on the day of JEE and improve your JEE Rank.
Wish you all the best.
Ashwin (IIT Madras).