yes candidate getting a percentile of more than 90 percentile will qualify for writing jee advanced

Dear Aspirant,

Usually students scoring 90-91+ percentile in JEE Mains qualify for JEE Advanced (for general category). So the top 10 -9 percentile students are eligible.Every year 150000-200000 candidates qualify for JEE Advanced. In these nearly 50% are from general category. For a candidate in general category with 92 percentile  will be eligible for JEE Advanced.

Check these :

https://engineering.careers360.com/articles/jee-main-cutoff

TIPS FOR JEE ADVANCED-

https://engineering.careers360.com/articles/how-crack-jee-advanced-2021