To be eligible for JEE Mains 2025, the National Testing Agency (NTA) requires that candidates must have passed their class 12th examination or equivalent with Physics, Chemistry, and Mathematics as mandatory subjects. Since you have studied both Mathematics and Biology, Mathematics will be considered as one of your main subjects along with Physics and Chemistry.

The eligibility criteria generally do not specify a minimum percentage in individual subjects, but you must have passed each subject. Your overall percentage of 84% indicates that you have done well across all your subjects, including Mathematics.

Given your 55 marks in Mathematics and the overall percentage of 84%, you meet the basic eligibility criteria for JEE Mains. However, it’s always a good idea to check the specific eligibility requirements for the year 2025 on the official JEE Mains website or brochure to confirm any changes or updates to the criteria.

So, you should be eligible to apply for JEE Mains 2025.

hope this helps you!!