Hey.

To be eligible to appear in the JEE Mains entrance no minimum marks are required. You just need to pass in your 12th or the qualifying exam. Hence you seem to be eligible for taking the JEE Mains entrance exam. 

You can use the link below to check the other eligibility criterias.

https://www.google.co.in/amp/s/engineering.careers360.com/articles/jee-main-eligibility-criteria%3Famp

Best of luck!