Your rank can be predicted by using the formula, (100-your total percentile)*869010/100. In your case, your approximate rank would be  7525. 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:

At this point in time, it is difficult to predict the JEE Advanced qualifying marks but 85 percentile and above should be an ideal score. But with a percentile as amazing as 99.134, you should have really good chance at the best of the colleges should you prefer to appear for JEE Advanced.