Dear student,
Yes you can appear for jee mains if you appear for class 12th boards once again. The eligibility of jee mains 2021 says that:

• Candidates should have passed class 12 or qualifying the exam in 2019 or 2020.
• Candidates appearing in class 12 or equivalent qualifying exam in 2021 can also apply for JEE Main 2021.

To know more about the eligibility criteria you may visit the following link:
https://engineering.careers360.com/articles/jee-main-eligibility-criteria
But to take admission in class 12th, you need to first take admission in class 11th.
You can check the eligibility for class 12th boards of cbse from the following link: https://school.careers360.com/exams/cbse-class-12th

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