Hii

77 percetile is a bit low score, but as of now we can not predict exactly what the rank will be as the fiinal result is yet to be declared and will be announce after the april session is completed.
For being eligible for JEE Advance you must score around 80 percentile, so i would request you that you try to score higher marks in April session and improve your chances of getting admission into top colleges and be eligible for JEE advance.
The cutoffs of different colleges are yet to be announced and you can be sure about admissions and eligibilities once these are annouced.

Hope this helps
Thanks!