Hello,
Candidates who qualify in JEE Main will be eligible to appear in JEE Advanced.The cut off for JEE Main 2020 will be released once the exam is concluded, the cut off will depend on number of candidates appeared, difficulty of exam, number of seats available etc.A percentile 85 or above is a decent percentile to qualify.So there are decent chances of you qualifying in JEE Main.You may concentrate more on JEE Advanced.
Hello student , eligibility criteria for JEE Advance are :-
1. You should have qualified CBSE 12th examination with minimum 75% or you must be in top 20 percentile of your state board examination with maths , physics and chemistry as your main subjects . So if what you mentioned above is your percentile not percentage then you are in top 20 percentile so you have qualified first eligibility criteria .
2. The most important criteria for qualifying for Advance is to clear Mains . Since you have not mentioned your category but even if I consider you as general you may have chance of being qualified for advance as privious year cutoff was about 90 percentile but it may change this year based on number of students participated and their performance . So you are at a position where you may qualify or not if you belongs to general category and do not have EWS quota but if you have any quota like EWS , OBC-NCL , SC ,PWD etc you are qualified .
But still I want to advice you to focus on July exam to improve your performance .
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