Hello,
A student may appear for JEE Advance only twice in successive years after class XII that is just after class XII and the next year.
But you can appear for JEE Mains three times i. e just after class XII next year and then the next year.
You can not appear for JEE after 2 years of passing class XII
Follow this link for more
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-advanced-eligibility-criteria/amp
Good luck