Hello dear student,

As you said you have obtained 83.18 percentile in JEE mains exam ideas to do there is a chance that you qualify for JEE advanced. And you can expect your rank to come in between 146000- 146300. This is a really good percentile and you can expect a good college at this percentile. I hope this was helpful for you dear student.

If you want to calculate your rank by your own then dear student you can do it as total percentile score is the percentage  of people ahead of you. 869010 are the number of candidates appeared for Jan exam. So rank formula is (100 - your total score) X 869010 /100.

Thank you