The Philippine coast guard exam of 2014 is scheduled to take place starting from May 17th according to http://www.coastguard.gov.ph/
Sometimes it is better to contact the individual base coastguard base of your local district, and ask when they plan to hold exams, as not all provinces stick to the correct date.
For example, I was one month behind the national schedule, and it meant I could not join employment as a coast guard with most of the other recruits...
You can find a list of all the coastguard districts at http://www.coastguard.gov.ph/index.php//
If you have any questions about this process, please get in touch with:Headquarters Philippine Coast Guard
PunonghimpilanTanodBaybayin Ng Pilipinas
139 25th Street, Port Area
1018 Manila
You will also need to have a look at this application form if you plan to apply for a role with the Philippines Coastguard:
Good luck becoming a coastguard!