Dhiyaneshwar, I will tell you how you can enter into Indian Navy via JEE Mains score.

Indian Navy invites applications for 4 year B.Tech degree course under the 10+2 cadet entry scheme through the scores of JEE Main 2019. You can apply for Indian Navy B.tech Entry scheme through JEE Main. Only unmarried male candidates can apply for Indian Navy B.Tech entry scheme. After you successfully apply for the scheme, you will be shortlisted for Service Selection Board (SSB) interview on the basis of yourJEE Main 2019 scores. After the selection process of Indian Navy B.Tech Entry scheme through JEE Main 2019, youwill undergo training cost of which will be born by the academy.

For more information, you can refer to :-  https://engineering.careers360.com/articles/indian-navy-b-tech-entry-scheme-through-jee-main

Feel free to ask if you have any more queries.

Hope this helps!

All the best!