Hey Jignesh ,
The selection procedure for Indian Naval academy  through UES   is as follows
1. in the final year of engineering degree, people from naval recruiting directorate will come to your college
2. there will be a group discussion and Personal interview by the officials on the basis of your academics and if you get shortlisted , you will get a call letter for SSB
3. On clearing the test in service selection board , now the candidate has to go through a series of Medical checkup , if the candidate is declared fit by the medical board , results in his final selection
4.now all the candidate has to do is to wait for the merit list , if he makes the cut , then he shall receive call letter for the academy
Hope this helps