For you to join as a 10+2 technical entry or the tes , there are certain criteria of eligibilty that are to be fulfilled 
Age limit : 17 to 19.5 years
Education qualification : 12th pass with min 70 percent in pcm
Now there is a comprehensive selection procedure when it comes to joining as an officer , you need to be apply , for it , the applications are out twice a year and if you clear the cutt off then you will appearing for SSB , clearing it results in you appearing it for your medicals and then merit list is out in few months .
All the best hope it helped .

National Defence Academy & Naval Academy Examination

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