Hello Suman,

Congratulate your son on scoring 85percentile in JEE mains. 

According to our team of experts candidates with percentile more than 75 may be qualified to sit in Advance ,compared to last year the cut off was 74. 

So let us hope for the best .

Thank you. 

Hello Sir

Greetings

 The Final cutoffs to qualify for JEE Advance will be released after the JEE Main April get over therefore Right Now nothing can be said regarding the qualification for JEE Advance But score seems to be sufficient But this is just prediction so Better Prepare for JEE Main April and Perform better and Just wait till the Cutoff Released by the National Testing agency after JEE Main April get over

Hope this Helps All the Best.