The recruitment of asst. commandants is conducted bi-annually.

The advertisement  is given in leading national newspaper in both hindi as well as english  or you can search it online

After you filled the form Shortlisted Candidate as are called for test like mental ability and health.

For different  Posts, Different Selection procedure are there.

keep checking http://joinindiancoastguard.gov.in/ for any update.

To join INDIAN coast guard as an officer , you should be a bachelor of science or technology with minimum 60 percent of marks to appear for the interview , then you face a selection procedure and a medical checkup .
As far as commercial pilot license holders are concerned , you shpuld have atleast 60 percent of marks in your 12 , there is no written test for the service and the entry is for male candidates .
All the best .