You have got 77 Percentile. Your percentile is some how low but for JEE Advance very few days are left so denote these days properly so as to score good in that and you can get good college too.

Also focus on JEE ADVANCE Previous Year Exams and that will be very much helpful for you.

And Also Don't be sad, You even can get good colleges as you also belong to EWS Category.

I will recommend you to check All The Colleges, That is available for You on basis of your rankings and Reservation, Then You can also check that at Our JEE MAINS COLLEGE Predictor. That will be very helpful for You.