Your rank can be predicted by using the formula, (100-your total percentile)*869010/100. In your case, your approximate rank would be 58197. It’s difficult to tell exact qualifying marks for jee advanced eligibility but if you are getting more than 85 percentile score then you have decent chances to qualify for jee advanced. You can predict your colleges at: https://engineering.careers360.com/jee-main-college-predictor?