Hi Jen. What do you mean by this? I think there is no limitation how many times you wish to take an English test as long as you have the money to pay and patience to do it again. I know you already passed the TOEIC (which is no longer valid) but if you want to take IELTS (or equivalent) in the Philippines yes you can do so. I'm not sure about the waiting time and/or the number of accredited institutions over there but if you're worried of taking the test in UK then do it quickly while you're still home.
Define study? Reviewing for the test in a UK English test center or school is not studying in my opinion. Your English is fine therefore, you don't need to enrol and pay £250 to prepare yourself for the English test. All you need is self and online practice. Chillax!