You need a compression tester and a leak down test kit. I see you are in Jamaica so I don't know what kind of auto shops you have access to there, but if there is a place you can take it to and have those 2 tests done I would recommend doing that and posting back with the results.
The other option you have is to buy a compression tester and leak down testing kit and do the tests yourself. Usually, if you don't have the tools already, it is cheaper to have a shop do the testing for you.