If you have PCAR, then go to part 2 which is about personal license. and on chapter 2.10.2.2, you will see all the requirements to get class 1 medical.
and CAAP might accept some tests like a X-ray taken outside (cos they don't have that facility now due renovation) though most of pilot in Philippines
would go to CAAP in Manila and do their medical check and renewal and so forth.
Actually, their tests are pretty simple. if you are able to drive a car then you will have no problem at all. no worries.