Hey!

For joining the Indian Navy at the cadet level entry: The students who have cleared 12th or equivalent exam from a recognised board with minimum 70% aggregate in PCM and at least 50% marks in 10th. One can apply for the exam through the official website of Indian Navy. You are also required to appear for NA/NDA exam conducted by UPSC.

You can get all the details here:

https://www.joinindiannavy.gov.in/en/page/selection-procedure.html

I hope this helps you!