game tester in sg have.. bad pay and your scope sometimes double-up with forum administrator, or in-game manager.
Very little job advancement.
Overseas are abit different, because they make plenty of games, worldclass games and MMORPG.
in malaysia and singapore, they do more of marketing and network/systems instead.

with your qualifications, u are better off in different IT job rather than a gametester. If u like games, u can still join a game company and have a more fulfilling career.