See if you have good problem solving and if you have self studied for JEE MAINS and Advanced i.e., at least you know the paper pattern or the difficulty then with proper guidance you can crack JEE ADVANCED. But you should know that for JEE ADVANCED you can only apply for 2 times i.e., one time on the year of appearing for the board and the other time will be 1 year post board. As a result, if you give board this year then you will be only eligible for JEE ADVANCED 2022.

To know more about JEE MAINS visit the link below:

https://engineering.careers360.com/exams/jee-main

To know more about JEE ADVANCED visit the link below:

https://engineering.careers360.com/exams/jee-advanced

I hope this answer helps. All the very best for your future endeavors!