Hello,

Yes, you will be still eligible to appear for JEE Advanced if you repeat your class 11th and class 12th. A candidate can appear for JEE Advanced for two consecutive years from the year of passing in the qualifying examination after qualifying in JEE Main. It means that if you have passed class 12th in 2021 you can appear for JEE Advanced 2021 and JEE Advanced 2022. If you repeat your class 11th and class 12th and pass in the qualifying exam in 2023 you can appear for JEE Advanced 2023 and JEE Advanced 2024 provided you must have qualified in JEE Main 2023 and JEE Main 2024 respectively. Also the age must not be above 25 years for general category candidates and for SC/ST/PWD there is a relaxation of 5 years for upper age limit.

To check more details you can click on the link below

https://engineering.careers360.com/articles/jee-advanced-eligibility-criteria