Wow, I have never yet met a Jehovah's Witness wannabe who couldn't figure out how to become part of the religion. No Jehovah's Witness is born in to it, no matter what religion the parents. There are no certificates. Regardless of how much you have studied on your own, Syven, you are not a JW yet. A Jehovah's Witness is one who has studied with another Jehovah's Witness for at least six months, and has been baptized in to the religion. To maintain their standing, they must remain morally pure, attend all meetings, and participate in field service. Any slacking off in any of these areas put their standing at risk.
It is laughably easy to find a Jehovah's Witness to study with, even in a foreign country. Syven, since you are familiar with the www.watchtower.org site, submit their fill-in form and request a study.