Hello,

The basic eligibility criteria for Jee exams is Only those who have cleared their Class XII examination or any equivalent qualification examination 2019 or 2020 or 2021 will be eligible to apply for JEE Main 2021.

So you have passed the class 12 then you are eligible to apply.

Class 12 marks have no weightage in the preparation of JEE Main ranks. You should know that the ranks will be determined based on your score in the entrance exam. However, for admission into IITs, NITs, CFTIs the score that candidates have secured in their class 12 board exam will be taken into account.

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

Hope this helps!!!