To become eligible to give jee advanced, you should have the minimum cutoff marks or percentile in jee mains which are announced after the second jee mains exams. CRL of students and the cutoff percentile to become eligible for jee advanced is published through the official site.

You have to wait for the final cutoff percentile to know whether if you are eligible or not. For getting more percentile i would recommend you that you should also give second jee mains exam so that your percentile increases and you can become eligible without any worries.