Your rank can be predicted by using the formula, (100-your total percentile)*869010/100. In your case, your approximate rank would be 460575. Let's say the number of candidates for April exam increased to 12,00,000 then your final rank shall be (100 - your total score) X 12,00,000/100. Now to predict colleges, please use our college predictor:https://engineering.careers360.com/jee-main-college-predictor