Hello Aspirant,

On the day of JEE ADVANCE exam you need to enter the examination hall before 7:30 A.M. Although it is always recommend to reach atleast 30 minutes prior, to avoid any kind of unfavorable changes.

And candidates need to take their seat in their respective exam hall for Paper 1 by 7:45 A.M. and for Paper 2 by 12:45 P.M. after biometric registration/ verification process.

Further you can also go through this article to know more related to JEE ADVANCE exam day guidelines -

https://engineering.careers360.com/articles/jee-advanced-exam-day-guidelines

Hope it will help.

All the Best.